The technology is AMAZING! AMAZING until next cycle, anyways. The it will be eclipsed by the next AMAZING thing. I'd imagine we're talking 18-24 months with regards to the market duration for these tech-enabled amps. You can count on the guts to last 5-7 years (if the rest of the technology sector is any indicator.) I've owned Mustang II, and V, which sounded nice for me and sort of met my needs at the time. I bought the V closer to the end of its Marketing lifecycle, a year or so before the Mustang GT series came out. I've owned a DRRI for about a year now, so halfway through my warranty. PCB build worries me some as a consumer. But those two hand-wired guys from the early 60's (a Gibson GA45T and a Supro 1606) don't worry me a bit. When components fail, they'll be replaced.