I've had one since they first came out.
Used it in a recording/mix rig back when plugin reverb and delays sounded like donkey balls.
The pcm96 or the Bricasti m7 were the gold standard of hardware reverb and delays, and probably still are, along with the high end eventide stuff.
There were some issues with plugin functionality and claimed connectivity functions that never really worked correctly, but I sent it a stereo aes/ebu signal and brought the analog outs back into my analog mixer.
Used it on a ton of mixes, and it sounded killer for realistic spaces and ambience. Never really dug into it for special effect type sounds like chorus, flange etc.
I think it would be overkill in a guitar rig, but with the evolution of plugins these days, this kind of studio hardware may be available at low cost on the used market. Don't know, haven't looked in years.
Stellar sounding unit, but depending on pricing, you may want to look at eventide hardware for the types of effects guitarists would gravitate towards for a rack rig.