First off, there are a couple of Audio Assault plugins missing from here.
One of them is Dirt Machine, which is essentially a suite of overdrive/distortion/fuzz pedals (amazing value, from a classic boost to an OCD, with the likes of Big Muff, Texan Pride, Soul Food, and even an not-so-shabby acoustic sim).
The other is Emperor, which along Dominator and this here Bulldozer make for Audio Assault's collection of guitar rigs.
Guitar rigs because you actually get it all inside a plugin (except a noise gate/denoiser and rack effects). From 10 bread and butter stompboxes that you can place in front of the amp or in the fx loop, a 2-channel high gain amp, and a cab section with the staple cab choices (American, British, Japanese and German), four different microphones and a user interface to position them and distance them, or the choice to load your own inputs, these three amp rigs bring very different and useful tones to the table.
While the Emperor focuses more on punchy high-mids, Dominator is more of a mid-gain amp, and this Bulldozer goes for the low-mid presence (suposedly a recreation of a certain Diezel amp). And here is where it truly shines, maybe because of the type of frequency response this amp head is amazingly versatile in tone.
I don't do metal whatsoever, I strive for getting delicate textures and tone into the productions I'm involved in, moving towards a more post-rockish, shoegazey, slowcore kind of sound. I can get specific and unique tones out of this plugin, without having to immediately reach for an eq to slice high-mid frequencies and to low-pass above 10k, and this is saying quite a bit.
I'd say in my context, Emperor would be more for scorching leads, Dominator for discerning shredding and Bulldozer for more discrete cleaner presence, although it can do almost anything the other two do.
But hey, get them all, you won't go wrong.
I have only one gripe with these amps: tweaking the reverb stomp has crashed my DAW a few times. Would be great to include a VST loader in the stomp section for loading other plugins (such as Dirt Machine). Other than that, they're great.