I already have the VH4 amp but got the Herbert because of the sparkling clean Tones that the included IRs let me get. I tried to get good toned out of UAD Brainworks amps and for the life of me nothing sounded realistic or good until I moved the amp out of Unison into regular plugin slot. I also turn down the Gain on the interface all the way down and volume on my guitar to about 5 and then I turn up the gain on the plugin. To me that sounds good, chunky, thick, growling. Everything in unison slot sounded like a kazoo. Different strokes for different folks, I guess. Anyways with enough tweaking you can get any sound you want out of this amp.