Its only "yesterday"'s technology if there is a better, more competitive product. For ME, there is no better theoretical solution out on the market right now:
Polar Pedals =
1) cant get power data on a GPS unit
2) more expensive
3) PITA to calibrate and switch between bikes.

Quarq/SRM =
1) I have a proprietary crank on my TT bike, therefore no option for crank based power (and it is the stiffest crank ever made, so I am not planning on giving that up)
2) ...But even if I DID have the option of switching cranks, I have a standard setup on the TT bike and a compact on one of my road bikes - I'd like to not have to buy multple power meters or have to switch my chainrings in addition to switching cranks - that would suck.

Stages =
1) every issue with Quarq
2) accuracy is lower on the stages

Power tap =
1) unless I buy 2 wheels, I am stuck with one wheel for both training and racing / tris and road races (no disc allowed in a road race you know). Therefore if I want to race with power in triathlon with a disc, I need a fumble with a wheel cover (1+hr) and have to live with lower aero benefit and lower quality bearings than my super-9 has.
2) If I want to train with power and race with a real disc, I have to forgo the race power and switch to cork brake pads (not a big deal, but still a pain)
3) My tri bike looks stoopid with an alloy training wheel on the back and an 808 on the front.

So the Vectors are not "Yesterday's Technology" because there is nothing like it that exists right now. The one caveat to my perspective is that these benefits are in theory. Obviously the performance and durability of the actual product will determine whether its worth the $1500 price tag. Speaking of which, I haven't seen anything about pricing other than the Garmin website which says $1500. The $1699 figure is from a guy who appears to be trying to take advantage of his anticipated short supply/pre-order buzz and make an extra $199 at the cost of consumers. [Edit: Based on the post following this one, I may stand corrected here. The $1500 reference is no longer on the Garmin website, but I have not seen anything official that says $1699 is the MSRP]

Those are my reasons for being excited for the last 3 years and still being excited today ...

PS - In my family I we have two 4 year old FR405's and a 910xt and all three have functioned well - somebody said it, no one starts threads about garmins that work the way they are supposed to (which is the vast majority), only threads about problems. I have also heard that Garmin is pretty great when it comes to replacing broken product. And for gods sake, we are kicking the crap out of these units, you have to expect some failure some of the time.
I think I am going to go start a thread that says I love my garmin so we have an offset to all of these people who post about problems.

My $0.02

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- Pete

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Luckily my over eating disorder is offset by my over exercising disorder