MIDI via USB devices

[vansinn]

Anyone having experience running MDI over a USB connection?

I've been looking into building a compact 2U 19" rig comprising an MP2 and a Lexicon Vortex (for solo delays), and will need a compact device for reverbs, delays and a few more effects.

Now, several compact devices exists on the market, having a mini USB connector.
Some of those can't be remote controlled; the USB being there purely for setting-up and save/reload.
However, some can indeed be remote controlled, with the question remaining: To which degree?
I see some accepting merely PC commands, where I'd prefer CC control of parameters.
Some have a mere 50 or so program slots.

I'm looking at the Zoom MS70CDR, which can be controlled via USB-MIDI PC commands, has 50 PC slots, no MIDI mapping, no CC control.

Anyone with experience into such [compact, pedal size] devices?