The factory presets sound dull, lifeless and very boxy. I got a decent sound myself adding a massive amount of EQ and a distortion box pedal before the amp insert. Definitely, this is not what I expected from an UAD plugin and I hope they will fix it and make it useable ASAP.
As soon as UAD get back to work with emulating serious gear, the credit will once again raise up. This Brainworks stuff is really only mediocre. You can have better sound from TH2 or Amplitude. Engl is not supposed to sound this dull with all presets with bass rotary on max.
I have tried practically every amp sim and IR cabs out there, in addition to the real thing. The presets on this one all sound the "same": very dull. UAD should stick to what they do best: model vintage outboard. These amps are nowhere close to the competition which offer more options for the price of those 2 amps. Here you get less for more.
I was extremely excited when I saw UAD was finally offering a guitar modeling plug-in. So I downloaded the demo. If you're into heavy metal and that type of tone then you may like it. I am more into classic rock and blues and this just does not fit my needs. Come one UAD develop something for the blues and classic rock players and we'll buy it. But this is not going to become part of my UAD plug-ins.