I got an AX-8 recently after being on the wait list since October. That wait was nothing compared to how long I had to wait to the Ultra when they came out. So having used an Ultra I thought I knew what I was getting into. I had been using a Port City Pearl 100 and their Standard 212 cab and a few pedals. Great rig. Hope I don't miss it too much. Sonically I think the AX-8 sounds amazing. I'm currently running it through an Alto TS210. I no longer have the Ultra so I can't A/B them but since it's been several generations of software since the Ultra and working from memory I'm pretty impressed with Quantum firm ware. Mostly I'm just using a Twin and some drive blocks, A /13 CJ and some drive blocks and some of the ODS models. It feels like a tube amp, responds like a tube amp etc. No complaints sonically. Programing is not nearly as intuitive as I'd hoped. I think I was thinking it would be similar to what I had experienced in the past. It's not. I chock that up to it being a pedal and having buttons to program etc. Working from the pedal is not as easy as I would have wished. The software editor is great though, just like I remembered. I still have problems programing the expression pedal for volume and wah etc. but that's mostly my problem not the AX's. There is a large glitch/lag when adjusting from the pedal to the editor or vice versa. It simply cuts out and then cuts back in. No big deal at home. Big deal playing out although I doubt I ever have the editor open during a live performance. I never experienced this with the Ultra. I never had the controller for the Ultra and I would use my lap top to turn effects on and off in real time live and it worked great. I looked like a total geek but it worked. It wouldn't with an AX-8. I think that editing an effect on the fly in a live performance would be awkward as would adjusting the amp in real time stooping down, getting on one knee etc. Lastly I seem to run out of processor pretty fast. I never experienced that with the Ultra. But if this is the same processor running more complex algorithms it only makes sense that it's going to run out of gas faster. I'm not building complex pre sets and I don't run several instances of effects at the same time. Just drive block, delay and reverb. Using the high resolution cabs seems to max it out faster. When you max out the processor it shuts off the reverb. Anyone else experience this?