As many of you may know I've been building a BFM S15 w/3015 over the last month or so. Tonight I got a chance to play it at a little bar we work at. I've been using an Ampeg Pf500->Hartke 115XL. Tonight I used the PF-500->the S15. The BFM is a good 25 lbs lighter and at least 3db more efficient. Tone is a bit more focused and every bit as deep. It will be my go to cab from this point on.