I have used Jesses on KTM 950's, Elefants, and 1150GSA, and in all the typical back country places. Indestructable! A friend T-boned us in China, had it pounded out and still works and still waterproof. I use Helen Two wheels liners and they work quite well with the narrow styling of the Jesses. The narrowness of the bags is one of the more important points. As is the simplistic mounting systems.
I do have a 1200 GSA with BMW's Alu system. I do love them and the BMW liners (very drybag like). They came with the bike or I would have put Jesses on it. No complaints on the System's functionality, but do feel the cases are vunerable in a crash (not done since I got the bags in '06!). The alu is much lighter weight and might crush, but like my Jesses could be pounded back, but maybe not so straight???