July 30, 2018 I downsized from a Mesa .50Cal head & Mesa Recto 2x12 Cab which totaled 100 pounds. My new rig is a custom built 2x10 combo (http://www.trmguitarcabs.com/index.html) with a built-in 1U slot for a power amp. I went with the Rocktron Velocity 100LTD based on good reviews and fair price. BTW, the combo with Rocktron and 2 Jensen Neo Tornado speakers weighs under 40 pounds. I dropped 60 pounds, went stereo and no more tube maintenance, without sacrificing too much tone. I'm using my old Digitech RP500 as my preamp with a stereo cable going to the Rocktron. Highs and lows are on par with the Mesa, maybe a bit warmer. The RP patches need minor tweaking to get dialed in to the new power amp/speakers/pine cab....no biggy. In fairness, there is a small but noticeable lack of depth of tone, harmonics and sustain compared to the Mesa (RP500 bypassed), but thats what you trade-off for abandoning tubes. Its not a big difference, but noticeable. However, in clean tones (Fender, Vox, Roland models) the Rocktron really shines. Ping-Pong delays, Flanger and Chorus effects are in stereo and sound lush and spacious. The Rocktron is loud enough to gig with in smaller venues. Its fan comes on when it gets hot, emitting a whining noise which is inaudible while playing, annoying when not....thus 4 stars. While shopping for guitar specific rack power amps, I found Rocktron, Matrix, Quilter, ISP, Harley Benton, Koch and Seymour Duncan. With the popularity of amp modelers, one would think someone would have done a product roundup to compare features/benefits on power amps. No such luck. I rolled the dice on the Rocktron and it does sound good, but other than pricepoint, I'm in the dark as to how it compares to the competition. In summary, nice warm sound, a bit tube-like, stereo, loud, whiny fan, U.S. company, plays nice with my multi-effects board, fair price. Overall, very satisfied.