I've had the 2006 Transits for about 1.5 seasons now. They have held up well, and are comfortable, BUT I do get a lot of heel lift. The heel area is fairly wide, so I get no support there. So unless you heel is very wide, I think you will get heel lift.
I'd definitely try get the '07 with the kidneys. All the 2007 LF bindings seem to have improved with respect to heel hold.