Just traded my Carvin BX500 for a Mark I 700RB. Can't wait for it to get here. While it's significantly heavier than my BX500, it is also significantly lighter than my B1500, so I'll call it a lightweight. I'll be gigging with it almost immediately, so will post some info once I do. Not that there will be any earthshaking revelations ... this is a pretty well known head. I've liked the GK's I've played, but have never owned one other than the little Microbass combo I had for a while. Looking forward to getting to know this one and seeing how it plays with my various cabs. Cheers, Liam p.s. thanks Lee Barker for the trade!