This is what I posted in a PJB thread back in 2008 😮
I had the Dalek, whick was the full PJB stack with the M500 head. In a word awesome. It's MOSFETs but IMO it totally outgunned Ampegs (I have owned Ampegs). It's all there, you need to spend some time with it then you'll find your ideal sound. Then after you've spent more time with it, you'll find your ideal sound again! It's all there the tonal options are immense.
It's built like a tank (some of the components are military spec) and quite weighty because of it. There are people of this forum who's experience of PJB hasn't been good, but any email I sent was replied to either by Phil or one of the team usually the next day.
I only got rid, because the stack wouldn't fit into my new car.
Try it, and AB it with another amp, you'll hear the difference.