So today I picked up GK MB500 and it is a powerful beast. Using Bag End 15 and Hartke Hydrive 112. The 30 year old Bag end sounds rock solid. The almost new Hartke has some annoying resonance with certain notes [A and B]. The Mark Bass 410 I played it through at GC was rock solid as well. Wondering if the Hartke ain't all it cracked up to be. I was looking to go light but I have a feeling this may be a dealbreaker. May need to step up my game in the cab dept.