They're great amps period.They're great for digital amps.
It was $329 at GC, Adorama has them for $299.
I am really impressed with the feel of the amps, the response is authentic. Best of the digi amps I've owned was the Vetta II, if they ever make a Mustang that has the dual amp feature like that I'd probably grab it.
For a lesson room the Mustang II would be perfect IMO, the III might be overkill for that use.
Off topic but.....I just sold mine. Couldn't find a tone I liked out of it, and it was really complicated when it came to overwriting presets/saving my own tones. I was spending more time turning knobs than actually playing. I preordered one of the new EVH LBX II's.
I didn't really bond with the Mustangs when I've tried them.
Skip the presets and go right to amp. Turn off whatever stomps they have on and just use the controls like an amp. That said I only played thru the III so I don't know if the others sound as good.
I dug into the software when I had the 20w v2 and made custom patches (mostly dry) mixing amps and cabs, adjusting bias, etc. I had patches for the Hiwatt, Marshall JMP and 800, and the Orange.
I then ran some old live albums through the mp3 input and I was able to nail some of those tones.
Therein lies the issue for me with most modellers- it sounds like a recording, not a real amp in the room. I get that some people like that, but it drives me nuts.