i have two compressors, i use pretty often, to bring out a little more of the character of pres, or console-inputs. one is the mixpressor from psp, from mixpack 2. it is very fast to dial in and gives me what i need most of the time.
second one (especially for the masterbus) is mastercomp from psp. it gives me the smoothest compression i know in the pluginworld. great after tapes, or to give the masterbuss just a little detail and compact feeling.
system 1: windows 8 32 bit - samplitude prox, tracktion6, reaper system 2: mac osx yosemite - reaper(32+64bit), tracktion6(32+64bit)
both systems on: macbook pro (late 2009), core 2 duo 3,06 ghz, 4 gb ram, graphic: nvidia geforce 9600M GT 512 MB
Personally, after years of trying to get the sound I wanted I got it when I tried ELEPHANT!!! It has 'that aggressive sound' I was looking for.
But that was only after I got my mixes sorted with Alex b's mlc, all the various eqs and compressors and a big help in my mastering is the R2R and tape booster. Then with elephant on the end I was happy.
Also will ad that I used the UAD P limiter for about 1-2 years and was never happy with it, Elephant is better for an upfront, loud master. Also tried lot's of other limiters incuding waves, fabfilter.
Forthcoming releases on: Black Heart Label, Hyperdrive and Transfixion. http://soundcloud.com/100mg. 6 FREE Downloads on my soundcloud page. Nebula ALL over these trax!