I have the Engl E570. My two cents is... If you want a great, brutal, hi-gain/metal tone, this thing was born to rock. It has some very nice, silky cleans too, but everything inbetween, I was a little disappointed with. It's hard to describe. It has some programmable features that let you "customize" your presets, but all the semi-distorted or Marshall-esqe tones just sound like they have some kind of weird coating on them. Do I love the amp? Absolutely. I bought it for the hi-gain tones and anything else it can do is a bonus.
I use it with an Egnater M4 modular rack preamp which does a beautiful job on the clean-crunch tones, but imo, doesn't quite get the thick, tight hi-gain stuff very well. The two together are all I will ever need for recording.
If you need a jack of all trades amp, I'd recommend the Egnater over the Engl, but if you mainly just want some cleans and a killer hi-gain tone, then the Engl E570 won't disappoint you. From the clips I've heard of the 530, I think it is more in the crunch zone than the metal zone.
I hope this helps.