SSL could be replaced with PA Sub for sure. SSL can't compete with the UAD Bundle in my eyes. LA-2A collection and 1176s are out of the world and the only plugins from uad that i never managed to replace with something else native. On UADs hand, the 224 is superb, so is the pultec, 1073, API and Studer. With a bit of patience, you will get most of the stuff after a while for your $20-30. Also SSL has really god sales over the whole year. some still would be nice to have, but they are no must, if you already have plugs from other brands like PA, Soundtoys or Softube. on the rest of their plugs, i wasn't so super convinced anymore, after demoed them. I really like my x-eq2 that i use as stock eq plugin and got me no more need for pro-q3 anymore. I have several ssl plugs (no sub) and used to have an uad.