I am a 29yr old expert level Mtn.bike rider/racer & father to a 2yr old daughter..I fully re-searched tow behind trailers, the standard childseat (i.e. he/she is seated behind you)as well as the weeride.
Upon my decision of purchasing the weeride, it was mounted on a 2010 Trek Fuel Ex 8 bike.
The Weeride comes w/ optional mounting bolts for oversize headtubes, these were needed on this bike, as well as the same length for the mount on the opposite end (that wraps around seat tube)- weeride only comes w/ 1pr, i simply bought 2 more @ my local hardware store for $1.00, problem solved.
Weeride was mounted in literally 10min, and my daughter could not believe this experience!! Sure you DO have to ride slightly bow-legged (depending on many factors- bike size, rider, etc,) but the trade off of having her right there, in front of me seeing terrain as we go! It is 100% stable at speed offroad & after seeing us on video i quickly realized i was going way too fast w/ her! Its that confidence inspiring :)
The weeride is sooo much fun, very interactive & entertaing.
Also mounted on a modern day full suspension bike, i must say it rides like a cadillac w/ her on there, from paved paths to any offroad descents!!!
Price was no factor, i needed the best system out there-if you plan on bringing your child off the beaten path, this is the only way!!!