I just bought one last week and it's fantastic
It doesn't do super squashed compression but that's not what i'm after.
I've owned a number of compressors - EBS, Aguilar, TC and this is by far my favourite.
I've stuck my Markbass Compressore in the sales section as i'll be using the Diamond instead, it's easy to dial in and brings a thickness and warm presence to your tone without making it sound muddy.
I'd say the only disadvantage is having to power externally with an 18v adaptor adaptor but its not as bad as the power requirements of the Markbass compressore.
Definitely worth a try, it's blown me away and I won't be playing anywhere without it.