I started early this year on a 2011 TK3. The drivetrain is 3/32", so borrowing cogs or chainrings may be an issue. That's an easy fix, however. The wheelset weighs in at 6 pounds plus and the handlebars have a huge drop. Those are the only things I would have changed about mine. The ride was fine to this newbie, quick handling and responsive. I say would have because I went with a TK2 when I found one for a song.
Good luck!