I've had the Vox Valvetronix AD120 and AD60 over time and they do a reasonable impression of the real Vox valve amps up to a point, no complaints there. As for the Fender sounds on the same amp they do lean towards them in some way and if you have never experienced a real Twin Reverb the you may get a little excited by the results, but the trouble is that if you know your amps then you will hear the shortfall.
I have the cheaper Vox AD30VT and after fitting a quality speaker had some success with it at practice & studio level, it has to be said it sounded better than it's afore mentioned big brothers that cost over twice the price.
I also have a Fender Superchamp XD, which has normal Fender sounds that are superb, as well as the 'amp modelling ' channel for Vox & Marshall et al. These sounds fall into the same category as described above, they do lean that way but would never satisfy someone who has had the real amp that they are seeking to emulate. That said, they are not too expensive so one cannot criticise them too harshly. They are good value and again with a quality speaker fitted (in my case an Emminence Ragin Cajun) they are a good investment at a sensible price. Maybe the Mustang would perform better with a better quality speaker in the same way ? The model that my colleague bought was probably the single 12 100 watt
Mustang III, it was he who said it was 60w. He also had the bigger twin speaker model, but failed to get the quality he was seeking until the Twin Reverb arrived.
