I used tourances on my GS. They lasted well and allways had enough grip even in the wet and riding very hard.

I never ran the EXP but reviews on the GS forum suggested that they were not as good as the original tourance and did not last long.

I didn't like the sirac found it laking in grip for the way I ride and did not last very long.

At the end of the day you ask 100 poeple you will get 100 different answers. The best option is to try them and make your own mind up!