I only toyed with it for maybe half an hour so it's not a real review.
I was blown away by the quality of construction and the amount of options available.
Expression pedal, USB, MIDI, effect loop, tons of parameters, global mixer, pristine bypass, clean blend, it's got it all. It looks and feels pro, much better than all other multis on the market.
Unfortunately the sound was really disappointing.
There really aren't many effects available in this box. Distortion, wah, modelization, phaser, chorus, flanger, tremolo, mono pitch shifter, compression, delay/ reverb and that's it.
Compression is powerful but hissy.
Amp and cab models are well thought and efficient.
Distortion is very buzzy, think hive of bees in a box.
Modulations are very clear and cold.
Time effects are once again very tweakable but cold.
The whole tone of this thing reeks of 80s metal, very cold and obnoxious tone.
Parameters are difficult to understand and uneasy to adjust on the fly, obviously thought for studio rather than stage use.
Basically they made a really impressive, 21st century enclosure and pedal board but the sounds are 20 year late. At this price You'd expect a lot better.
Edit : I just went to Rocktron's site. Just listen to the clips they put in the player. I think they illustrate my thoughts very well.