I have heard this unit is especially 'coloured' in a way, which is something that makes it limited to special jobs. I think Steve is also right in what he is saying.

You might want to have a look here:

http://www.jeroenbreebaart.com/

or maybe

http://www.ddmf.eu/

for some quality plugins that prolly wouldn't cost together what the Sonalksis MB Limiter costs. I am by no means saying Sonalksis is making bad products but they have always been on the pricier side of things.