There are reports on BROL of minor chain slap/rub on the frame under the seat in two places on both sizes of the bike but perhaps more so on the smaller size. Worthwhile keeping an eye out for and possibly fitting protectors. I find it hard to believe, but worth checking.Took my first decent run on the Catbike today, it is fast and feels weightless, I have not got up to the no hands point yet but am riding clipless already, just need to remember to unclip at junctions as I do not do that on the trike. The seat is also very comfortable, it has the mesh type seat and velcro'd to that is a hd foam seat pad, the bike almost feels like it has suspension. The next couple of weeks see me all over the place so will not get to ride much but will start commuting by Musashi from about the 24th just to get used to 2 wheels again.