Which one and why?
Company with the most votes gets my money.
Chris
I can only comment on the Jammer GT’s which are on my road bike. I’ve always really liked them and found them very comfortable, but many other posters it seems haven’t.
I’ve used both and fit both to athletes/bikes.
VT: lower, lighter, less parts, less adjustability, more “minimilistic”, good for short stints on the bars, may not be able to spend lots of time on the bars w/o good core strength / flexibility
Jammers: sit higher, VERY adjustable, more comfy pads, more parts / heavier?, you can spend extended periods of time on them
-If you are using them for short stints and want minimilistic use then go VTech
-If you plan to spend longer periods of time on them and want a more comfy ste of pads go Profile
Hope that helps!
If you are looking for some shortie bars also consider the Syntace XXS, I have em and love em. Light weight and I can get full extension on them by rapping my hands around the upturned ends instead of being scrunched up like on the jammers or vision techs. the Deda clip-ons are also an option, light weight and good adjustability. The Profiles’ T2+ also can be moved back so they are short and you get the s-bend then, saw Matt Reed with this set up at a race.
Branden
Don’t know much about the Profiles, but the Vision Tech minis, to put it bluntly, are awful. I had a set on my road bike and took them off. I couldn’t stay in the aerobars for longer than five minutes at the time, and they were terribly uncomfortable on my wrists (which is where the arm pads are). I found them to be largely worthless.
RP
I also used a small size Syntace C2 on my old Giant TCR in the road position. They were a bit longer than my Jammer’s but not enough to notice. When I did tris on the TCR with a neutral seat post and seat forward in a multi-sport position I switched to the medium Syntace C2’s. They were without a doubt the most comfy aero bars I’ve ever tried.
As previously mentioned, also look at the shorty Syntace’s. If they use the same pad combo as the C2’s they’d have to be comfy.
I was looking at the new Profile T2 with the s-bend. They seem to be length adjustable so you could slide the extensions back and cut off any excess to make them short enough to use. It makes no difference if they meet the ITU draft-legal requirement for most of us so if they stick out past the shifters a bit it is not a big deal. Anyone use these? I use Syntace C2s on my tri-bike and I’ll second what Cerveloguy said about them being the most comfortable bar that I’ve ever ridden.
Hey, why not get a set of HED clip lites and hack off a good length of the extensions so that they are short. That way you can get any bend and length of extension that you want. Also, the armrests flip up. In a good way, not like the cheapy profile flip ups that rattle to death and fall apart. That way you can access the tops of your road bars. The HED clip lites are very minimalistic and lite, but offer full adjustability. And in the future you can just get longer extensions and use them like regular tri bars.
In my opinion, there’s really 3 types of clip on bars.
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Full (ie-Syntace SL/C2 - sized normally)
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Shorty (Jammer GT, Oval, Syntace SLS)
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Road shorty (Jammer SL, Vision Mini, Cinelli Spinacci)
The pads on the road shorties are not meant to be used to “fully” rest one’s weight on the contact points… you need to think of the extensions as narrowly placed brake hoods. Your hands are provide a much more comfortable weight bearing contact point than the pads.
Consider the vision tech XS time trial clip ons (230mm). I just put them on my road bike instead of the VT mini clip ons and the XS length works great.
Don’t know much about the Profiles, but the Vision Tech minis, to put it bluntly, are awful. I had a set on my road bike and took them off. I couldn’t stay in the aerobars for longer than five minutes at the time, and they were terribly uncomfortable on my wrists (which is where the arm pads are). I found them to be largely worthless.
I’ve noticed quite a number of them on Ebay for around $50-60 so maybe that is why.
I’ve got a set of Oval Concepts A700 Slams on my road bike and really like them.
I have the Jammer GTs and really like them. I can get comfortable for long distances and all that. I suppose it has to be fitted to your riding style well, as with the rest of your bike. Only complaint though is that it’s damn heavy.
Hey Allan, hear you finally broke down on bought a proper rode bike. I finally bought some clinchers.
Jeeze, what’s this world coming to. 
See you at the hill ride Thursday maybe.
Hey, why not get a set of HED clip lites
Are they really 200 dollars? For the aluminum ones???
I think the jammers suck. Get the T2’s instead.
I went with the Jammer GTs, but made a few modifications, including some s-bend extensions - here are the pics.
http://forum.slowtwitch.com/gforum.cgi?post=376202;search_string=search_string;#376202
The bars are low enough & the arm pad plates are far enough back for good aero positioning, but it also feels good on the hoods and in the drops.
I got out for a short ride on it Wednesday. Unfortunately I won’t make the hill ride the next 2 weeks due to “meet the teacher” nights. For my kids this Thursday and for someone else’s kids next week. One thing I noticed riding it is that I need some aero bars soon (which is why the opinions on this thread interested me). On the flats I kept wanting to settle in on them and all I see when I look down is my front wheel … I haven’t had a bike without aero bars on it since I started racing in 1990 so the front end looks naked 
I like both. The Jammers are more comfy, but the mini’s get me lower. So I go with the mini’s.
I like my Jammer GT’s. It took me over a year to finally get them positioned perfectly. I’m not really low, but pretty comfortable overall - which at my fitness level, is much more important.
I’m tempted to try one of those pretty cool modifications with s-bends that you see some of the more “crafty” posters have shown above, but my concern would be my knees hitting when out of the saddle…