Minor gripes:
-- The seat is only adjustable in two positions per bracket, and requires 5 minutes with a wrench to change. (Two different brackets are available.)
-- Fine-tuning the seat angle requires adjusting the suspension. Doing so adjusts (duh) the suspension.
-- Paint is too easily damaged. I paid extra for Challenge to do a custom paint job, so I had hoped for better.
...but please don't misunderstand. This is an AWESOME bike. It climbs better than any other I've tried (about 6 others), which is very important in Colorado! It's also extremely stable and comfortable at all speeds (4mph and above, of course!), even 50+ mph.
BTW: I just changed my wheels from racing slicks to mountain tires, and rode it through mud and icy slush along the Highline trail this weekend. It worked great -- no problems! Now I tell my friends that I've got "snow tires" on my bike.
