In my FX Browser, it indicates the 32-bit-hood of a plug-in, so wouldn't we know from that? It's helped me weed out a few older plug-ins that I might not want to use in new projects for fear of obsolescence and inefficiency.
I tend to forget about those Sonitus FX for some reason, maybe because they're in that bundled plug-in blindspot or they suffer a bit from dated UI look. But none of them has ever failed to do anything I've asked of it.
The multiband compressor is particularly nice to have, as there are few good freeware ones available, so getting one with Cakewalk is a treat.