Yeah, Miroslav would be one heck of an exception. Unless someone is ready to spend some serious money on orchestral libraries, there's nothing quite like Miroslav - it's
the must have.
Same for SampleTron, though in this case, it's more a matter of variety than actual quality. If all you want is the classic Strings/Flute/Brass/Choir, no need to spend money on plug-ins. Though w/ the current prices on IK plug-ins, unless you're on a very tight budget, you should probably grab SampleTron, anyway.
Sonik Synth - it didn't age that well...
SampleMoog... At first I thought I liked it. But there's something "static" about it. It just doesn't breathe...
I still use Dimension Pro on my Mac - and to my own ears, a lot of the instruments in it sound remarkably better than SampleTank, though I don't think its potential has been reached. And sadly, now that René is gone, I'm afraid it'll just fall by the side of the road.
Sad, because some other folks understood the potential of SFZ (hello Alchemy), and Cakewalk, who had a couple of cool and unique cross-platform synths missed an opportunity...