Other than the cracking w-arm, and worn out skid, I am absolutely satisfied with my 05. Not everyone wants to ride standing up, or rider forward. Once I got my sled dialed in last year (Stiffer spring, harder valving of the Mono Shock) I was riding all day long, tired-free, and hanging with F7s all day long.
As with any setup, there are strong points and weaknesses. The 05 RX really handled the problems for the RX-1, in regards to suspension performacne and handling.
IMO I think a rider forward setup will really hurt how the sled handled. It is going to make it feel more front heavy instead of balanced.
I am not bashing the 06's just saying that new is not always better for everyone.