Janne,
I got my 01V about three weeks ago. It's the second one we've bought but I have not really plyed with one until now.
Unfortunately I have not made use of the digital i/o yet, so no comment there.
I really like the machine. The user interface is straight forward (though some seem to disagree).
The only thing I would change on the design so far is to always have the master fader act as a master fader. Reaching for the master output fader before the headphone burst you ear drum only to find it's set to ajust the effects level has caught me out one or twice.
I have seen some negative comment on the sound quality of this unit. However, these tended to come from people who went on to describe the virtues of this or that $2000 compressor (i.e not quite in the real world).
In my home rig it has replaced a Mackie 1604 and StudioQuad effects unit as the main mixer/effects combination. I can definately say that we have remixed some tracks with a great improvement. This is mainly due to the built in compressors, 4 band eq and master effects.
I use the OMNI outs in pairs to feed the inputs of my two E6400 samplers and this works very well.
From the point of view of myself and my collaborator it could not be more perfect. We both have our own studios and rarely get the chance to work together. Being able to pass tracks back and forth across the samplers and 01v for perfect replication is just fantatsic.
Go and try one.
Paul