yeah, but how many do you need? It's not like we had a rack of 22 just simple compressors back in the day, let alone multi band... even at f'ing sunset sound or Conway etc, unless you wanted to pay extra for a side car rolled in....
and you can multi instantiate any one on that list you want... it's not like you got just one Waves C6 instantiation on a session kinda thing...
ONE of those has got to get it done for you, and while I have used some of those over the years, whatever... I don't know what the ssl one in particular brings to the table the others don't for the most part... so if you have any of those, or 2 of them... I'd imagine reading the manual and whatnot will get you where you need to be probably, (not even bringing up some the new tools that work on x-y-z planes on this etc)....
I've just never have heard in my life anyone say: "hey man, you GOT to get the ssl multi band compressor plugin... it has changed everything for me...." outside of whoever people ssl may slap on their website who used it once and gave a 'testimonial' in exchange for something else you know what I mean?
I'm not saying it's bad, I'm just saying if you have others, I'd imagine there isn't much that is bringing to the table imaginably if you were to fully understand the tools you already have on hand. Probably the stock stuff in your daw is just as good and capable (and that's not knowing your daw...). The ssl stuff is fine, but scratching my chin on looking at it last night, and whatever my mb needs are on that, I don't know if I would install it for free with it taking up a mere 50mb of drive space kinda thing.... I just don't know what it would do for me that I can't already get done, and I'd imagine the same for you... all I'm saying..
