I use
a lexicon MPX-500 (now updated for more user memories as
the MPX-550). It has analog unbalanced and digital I/O, and is fairly clean. Digital I/O is restricted to 44.1 or 48 kHz, but this is more than adequate for most applications.
Reverbs are good, chorus is good, flanging is good, delay is good, but the pitch transposer / corrector is a little too slow and coarse to use real-time. Still, it's a fun effect and may be useful if you are prepared to "slide" your pitch transposed track "a little left" when mastering to compensate for the lag.
It is great as a vocal reverb, and is fair as a guitar processor.
I use this to provide reverb. Very clean, not noisy, and reasonably priced for the home studio.
The sounds are useful, and the user interface very good indeed.
If you had a pro studio there are probably better Lexicon units to select, like the PCM series.
Under $1000, the Lexicons are certainly among the best around.