I've had a Burgman 650 as well, Moby Dick, the big white whale. To me the only advantage of the Burgy was it was quieter than the GT. One thing about the B650 is that some have had a transmission failure that cost's half the bike's worth to repair. It doesn't happen to all of them but if it's yours it hurts. There's also a bolt, a 'stopper' bolt in the transmission that chews itself up and needs replacement and inspection often. The ride is softer than either my Silverwing or the GT. Handling honors definitely go to the GT. I like the GT's narrower body better, the B650 has big rump. I sure did like the gas filler on the Burgman though, just like a car on the rear fender. No snapping it off when opening the seat. I find getting to things under the plastic is easier on the BMW. The burgman has a lot of plastic that depends on small tabs which tend to break off. I much prefer the exposed fasteners on the GT. I also like the Torx fasteners over allen, they don't strip like the allens do. All in all I much prefer my GT, it's just more fun to ride due to it's superior handling and acceleration.
Oh yeah, I put a Bestem top box on my Burgman. It wasn't too hard to mount a plate where the passenger backrest attaches. A 3/16th inch aluminum plate mounted on bolts with spacers underneath to get a level plate to mount the Bestem mounting plate on did the trick. I wired the Bestem box's tail lights to the Burgman with a plug and socket so I could remove the box when I didn't need it.
