These are great! The programming learning curve is a bit steep, but it's my favorite effects unit by far. Can even get a great envelope filter sound (my litmus test for multi FX boxes, and this one really does it for me) and the reverb is the classic Lexicon sound. You can route other effects into the feedback loops of the delays and all kinds of wacky things.
Downside: No spillover when turning off delays and reverbs without setting up a parallel effects patch (did I mention that the routing options are insane?).
I've tried so many options and always come back to this unit. This is a great price what with the upgraded chip and foot pedal. For the experimental player, it's a best in class. Someone snap it up!