I have the Nova Reverb and it has many ways of not sucking. There was never a decent digital reverb until last year and the Nova is more versatile than the only other good one I've heard: the T Rex RoomMate, which has only one way of not sucking.
The Doctor Scientist Radical Red Reverberator has gotten some good reviews, but I haven't heard it.
The Nova captures the sound of a Fender reverb tank beautifully, and has several excellent Hall, Chamber, and Plate sounds. It's particularly nice with long-tail, low-mix settings. The guitar's (dry) sound comes through with no discernible coloration. It makes no extraneous noise. I like it.