The Landgraff mod= replace Q2 with a power diode and Q3 with 3 Ge diodes.
I've had one for a while and I don't use it because I find it too fatiguing and noisy. I don't think it sounds very good as a DI either. I haven't tried it in front of an amp. I also do want a real AC30, not particularly because of this Amplug though.
I use my amplug AC30 in my friend's PA when I sit in at his gigs for fun. I run a stereo 1/8" cord into a stereo input on his mixer using a 1/4" adapter. It sounds really warm and punchy. Once i got used to the little control wheels, I was able to "switch" between clean and dirty pretty quickly. Of course the beauty of VOX amps is their response to your guitar's volume position so I really can get alot of variety out of it.
I've got the AC/30 and the Classic. I like the AC/30, absolutely love the Classic. It won't do a pristine clean tone but can pull off a rich clean with a single coil and light picking.
The Classic will pull off wonderful crunch tones. I live for the good SRV blues type crunch. But it will also do AC/DC in a big way. In fact I don't have to tweak the setting to go from Blues to AC/DC, just a switch from the neck SC to the bridge bucker and your good to go. Very dynamic and responds to picking attack very well.
I've tried them with a SS amp with a pretty vanilla clean tone, but I think the speaker sim ruins it trying it in front of an amp. Works very well with some decent 2.0 computer speakers I have.
I also have to say that this blows away any digital sim I have tried, including PODs and Zoom G2. I will say that I have not tried any of the analog Tech21 stuff to compare.
Save you money on the digital stuff unless you have to have the varity of effects. But if you just want a great sounding Brit amp analog sim, this is it.
I am sure that the AC/30 is great too, it just doesn't give me that vibe I get from the classic.