I'm looking at acquiring a new to me GS, not sure if I should go with 07-09 or opt for the 10-13 (not the GSW's). I previously owned an 07 R1200R, and with help from this forum have become sufficiently skilled to do the majority of service work. Which to some degree points me in the direction of the early year models. What I'm asking is for your opinion on the 10-13 model year GS's vs. the 07-09 GS's;

are they better and if so, in what ways?
How difficult is it to adjust the valves using the shims?
Any other input is appreciated