I got mine shortly after they were released and I've played dozens of gigs with it; it's been a real workhorse. I just use the combo, I don't have an extension cab. I've probably played an equal number of gigs with house sound and without and it's been great for both.
There's an important caveat for me though, and it may not be an appropriate live amp for everyone. I got this amp specifically because I knew I could easily get it to break up. I am a tube amp guy, but it's virtually impossible to get my SVT to break up at sub end-of-the-world volume. So for me, the lack of clean headroom is the point, and Clayton kinda said as much if you watch some of the promo vids. He wanted distortion. So if you need a really pristine clean tone at high volumes, this is likely to leave you wanting. I think when it breaks up though, it just sounds phenomenal. And it takes OD and fuzz beautifully.
Since I got this amp, people will seek me out every single time we play to talk about how amazing they think it sounds, and that's a new thing for me since changing amps. With our sound, the mid-focused voice and the natural tube distortion slice me right through the mix and it turns the bass into an extremely present force that drives the band (I am playing a Fender Aerodyne with Aguilar PJ pickups). It's perfect for us. But it is an amp that has a specific voice and character.
When there is house sound I have always had the sound guy mic it. We played live on one of our local college radio stations shortly after I bought it and their sound engineer described the DI as "a tiny bit noisy" so he used a mic instead. I don't really know if it matters that much for a regular gig, but I always ask sound guys to mic it anyway and people always love how it sounds so I have continued to request a mic.
It's been fairly reliable for gigging, but like many other people here, I did have problems with the factory preamp tubes and they were replaced. Aside from that though, I use the hell out of the thing and it's been great. I just love it and it's a core part of the sound of our band at this point. All that said, if I was playing in a band that really needed pristine clean tones, I might consider reaching for something else. But you may also find that in a full band setting you may not even notice the grindiness that much, cuz the thing just sounds great. Sorry, long reply, but just wanted to share my experience because it's the only amp I've gigged with in the last 2 years.