Convolution does not completely capture most of these reverbs. It also does not capture true left/right stereo processing. I'm not saying these impulses are not usable, but I've not heard impulses really sound like whatever reverb box they've attempted to capture.
Convolution can be downright decent at times, and I believe it has a proper place. For some types of reverb however, I just want to tweak up what is needed and fly with it.
These Lexicon plugs are the real thing. I got tired of trying to "get there", attempting to shoehorn other reverbs into places they don't fit.
I still use convolution verbs when and where they fit really well. And I use the UAD Plate 140.