Well, it's subjective. I sold mine, but it's the best I've ever used.
Previously, I've had experience with a Lexicon MX200/400 (forget numbers), a Nova Reverb (which I really disliked), and the Space.
To me, the Space still sounds a little too sterile, though it has some interesting (if not overpowering?) modulation capabilities. I think it's easy enough to use, but would have preferred a dial to jump directly to a list of labelled reverb modes, versus all of the presets. It doesn't sound like a convolution reverb either.
I think my ultimate realization was that I didn't think Reverb was necessary and it sounded a bit too digital on top of my mostly analog synths, and they didn't need any help to sound like I wanted them to. For instance there are some nice demos of the Space on top of a Voyager, and it sounds great, but in a mix isn't really neccessary when you can just set a long decay/release on the actual synth.
Further, my other frustration was that, as it only has the stereo input, I'd have to reverb something at the expense of another. My mixer's sort of annoying with setting up sends/return levels properly so I just didn't like doing it that way.
So, not wanting to use a computer (because it's my day job), OTB, I just decided dry is what works for me.
Anyway... the Space... if you like Reverb and need something OTB, I'd say try it, and you might like it. Some places (ex: Amazon) have pretty good return policies when you're within the window.