I have ridden many miles on RT's, but when it came to buying, to me the GS was the one to get, lighter weight, same comfort and do it all, more fun to ride type of bike. There should be few in the market used and with 20 - 50 K miles are barely broken in. The pre 2005 had the servo assisted brakes which I personally dislike as too grabby/powerful and more difficult to bleed. The only issues I had were a front OEM shock blew off in first 6000 miles, headlight glass cracked suddenly, fuel gage strip failed, and few recalls such as front brake lines reinforcement, fuel pump controller, ring antenna (alarm immobilizer cut-off) and such, all under warranty. It never left me stranded though. I have a GS11 app on the phone and the dev ice plugs in the bike can diagnose if needed anything on the road, also god when doing service maintenance. Later at 65k miles rear wheel/drive main bearing needed replacement. Otherwise knock on wood, it works like a sewing machine
It now has some chatter at cold idle, probably cam chain tensioners, goes away when it warms. The engine actually smoothed out allot I can barely feel it's running now, and has good power and tractor like torque. Get about 42 mpg constantly.