My AMP BH-420 was delivered today (thanks Crockettnj!)... I haven't been able to really test it out yet (it was pretty late by the time I got home) but I'm liking it so far. I basically just played it through my Epifani 310UL for 5 minutes, and then plugged into the headphone jack to see how the tone controls sound. Here's some initial impressions... This thing is loud, a good deal louder than the SWR SM-400 that I'm currently using. Once again, I only had it plugged in for a sec, but I really noticed that I was able to get more volume out of it. As far as tone, you can really tell that the AMP and the SWR have similar heritage...they are in the same tone family. They both have the 4 band semi-parametric eq in addition to shelving bass and treble, both have an "enhance" function, etc. When set flat, the tones are strikingly similar. One big difference I've noticed so far though is the AMP eq section is more powerful...a small bit of knob-tweaking goes a long way with it. Also the tone knob (precurser to the Thunderfunk's timbre knob) is just great...a little nudge to the left really warms it up alot. This may be the biggest benefit over the SWR - that tone knob gives me more variety of sounds than the SWR's more pure hi-fi voicing. The real test will come in a band setting, which I'll be able to do tomorrow night in rehearsal. I'll post an update then!