I also just put Yacugars on an 01 1150GS. I've only been out for one ride since installing them, and not very long at that, but certainly seems like a huge improvement. I expect I will notice even more of a difference when I start loading the bike or riding 2-up.
2001 BMW R1150GS, 2007 Yamaha FJR1300A
2009 BMW F650GS, 2012 Ducati Monster 796