For the longest time I have used a Markbass Jeff Berlin CMD 151p. Its a great amp, really light too. I bought a pf500 at GC off a blow out table as a back up. Then I ran across an inexpensive pf210he. It was fun to play around with but the Markbass has remained my #1... until recently. I started using the Ampeg rig at practice and I'm finding I like it better than the Markbass. Not cutting the Markbass at all, it's a fine amp. It's just that the Ampeg is imperfect in all the right ways. It's warm and a little grungy and just pulls off that 60s/70s Era vibe so well.