I recently purchased the Vox AD50VT which is the 50 watt combo version. It's an excellent sounding very versatile and loud amp. I'm into playing different styles of metal and Satriani/Vai and it can do all with ease. The setting that emulates the rectifier sound is killer and it sounds just as good as my Mesa
Triple Recto head. There's also a setting that sounds like Zakks sound also. There are many other settings on there from clean to dirt and effecgts that sound great too. It has a pretty realistic tube sound as opposed to the digital sound that I've noticed you get with a lot of Line 6 type stuff. I'd highly recommend this amp.