Oh, yeah!
Hi there!
Yup....there are a few Seven riders here. I have 2 Sevens, actually. And my DH has one.
I got a stock (noncustom) Seven Axiom in 2000 and loved it! It was one of those bikes that the LBS let me ride, and I immediately knew I had to have it! (yeah...hard sell...the LBS is good for that!). The bike rides like silk on the road. Extremely comfortable, very stable. I often say the bike has ESP - it knows exactly what I want to do and it does it all very well. It is very much a "point and shoot" bike.
After 7 very happy years with it, I finally decided to get a custom Seven ID8. Part of the reasoning behind that was a herniated disc in my neck that mades riding uncomfortable. As you know, it was a big investment and I hope that this is the bike I "grow old" with.
The ID8 is also very comfortable, yet to show how truly customizable the bikes are, it looks, rides, and performs very differently vs. my Axiom. I wanted a bike that was a bit stiffer, and this delivered. I wanted a bike that I could ride comfortably for long rides and again, it delivered. I just completed a brutal, hilly, century with no pain at all (other than, um, legs and utter exhaustion from completing brutal, hilly century!).
My DH rode Kleins for years. He loves the stiff, snappy ride of them. When his died and he needed a replacement, he rode the LBS owner's Odonata (the precursor to the ID8) and he, too, knew he had to have one. All of the benefits of his Klein (instant acceleration, speed, spot-on steering, stiffness, power for the hills) and none of the drawbacks (mainly, so stiff that it beats you up to exhaustion at the end of a ride).
Neither of us are sized such that we just don't fit stock bikes. Both of us have ridden stock bikes very happily for years. We're also not racers, but as with you, we do fast group rides. We're not bike snobs (at least, I'd like to think we're not!). And we're not wealthy. We just love to ride bikes and having a properly fitted custom bike that does exactly what we want it to do certainly makes it a whole lot easier to love what you ride!
Do a search on this forum for "Seven" - you'll find several threads from folks (including me) who discuss the build process and impressions of their Seven.
You'll find, I think, that all impressions are favorable! If you can wrap your head around the price tag, and are willing to commit to it, a custom Seven is a fantastic thing.
2007 Seven ID8 - Bontrager InForm
2003 Klein Palomino - Terry Firefly (?)
2010 Seven Cafe Racer - Bontrager InForm
2008 Cervelo P2C - Adamo Prologue Saddle