I gigged out my new-to-me V-4B for the first time, last night. Here's my take, so far. We started out with a mellow rendition of "Let's Stay Together". Playing fingerstyle with the tone rolled off, I have never had a bass rig feel so "right". I tried a few things to bring out the pick attack while leaving the bottom largely intact. I settled on the "ultra-hi" switch. Not as "spanky" as the Sunn (or as deep, for that matter) but it worked. Apart from that, I was pretty pleased with all 3 knobs at 12 o'clock. I wanted to experience that true vintage Ampeg "grunt" and I definitely felt it! As one would hope, this 100 watt amp did fill the room and punch it out a little more than my 60 watt Sunn does. Unfortunately, toward the end of the last set, I had hit my volume ceiling. That disappointed me a bit, given just how bulky and heavy this thing is. (A proper servicing might help - I have no idea what shape the tubes & caps are in.) So there it is. It's not the most practical piece of gear I've ever tried, but I'm glad I took the plunge. I welcome any other V-4 users' thoughts.