I've been running a Shorai lithium battery in my 1200GS for 8 years. Completely happy with it, and it has lasted longer than any other motorcycle battery I have used, except for the cold weather performance. If it is below 45, it takes a couple minutes or a couple crank cycles to get the battery warmed up enough to start the bike.
Would I do another Shorai lithium battery? Yes, I just put one in my Triumph last year and will certainly consider one when my R18 battery is shot. Would I go with something else in my GS that I used for year round commuting? Probably. The cold weather performance is a irritant and a delay in the start of my commute during the late fall and winter.