I'm one of them - I bought a Litespeed T3 w/ Ultegra Di2 last year. It is the only Ti bike I've owned, so I can't give you a comparison with the other brands but it has been a great bike for me so far.

Hampsten Ti bikes are made there as well by Brad Bingham

I bought a NOS custom lynskey frame on ebay from an online bikeshop, built it up and it was a fantastic ride.
The headtube developed a crack (prolly because I didn't have the right head bearing press) and they wouldn't warranty the frame.
Bit disappointed with that response, but the warranty only applies to the original purchaser
Took the crack to Chris Dekerf for a repair, he did a great job, I'm back biking and it's a superb ride

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res, non verba

I have an 11 year old Seven Aerios and I love it as much as when it was built. Their customer service was great and between me, my lbs and Seven, we figured out which bike would be best and then they made the frame, my lbs built it, I sat on it and it fit like a glove. It was not cheap,but I expect to enjoy the bike for many, many years to come. I have only great things to say about my experience with Seven! good luck!

I have 2 Litespeeds. Tachyon tri bike bought in 1998 and a Tuscany bought in 2005. Love both and still ride both. Seriously considered Seven for a road bike, but I bought the Tuscany frame and built up with Chorus for the price of a Seven frame. Ti is real.

I have a Moots road, CX and MTB, and love all of them. Each time I've dealt with the company they've been fantastic. I can't really speak to the other two brands, but I have friends who love their Sevens....for me, though, Moots is really hard to beat on any dimension except price. And even given the prices, I think the value is pretty good.

I have custom ti frames from both Lynsky and Moots, as well as Serotta and Roark. The Lynsky is the heaviest bike, the Moots has the best welding and is definitely on the lighter side. If I were in a position to buy a new custom ti bike at this time I'd probably check first with Moots, though would also consider a Seven.

Now that Litespeed (ABG) has taken notice that people wanting a Litespeed tend to want carbon...hard to go wrong. But, they are nothing with out the history of the Lynsky family. Period.

My call - I call Lynsky. Moots makes some crazy cool rides as well. But, if you want personal service (and want a custom) call Lynsky first, then call Moots and see how things feel. Ever since Herbert left ABG (a long time ago) service has become secondary)