Got to play around w/ the DDX3216 for about 10-15 mins last night. Didn't test out the recording signals or anything but here's my thoughts so far
1) this thing is a tank... but not too heavy, which should make it excellent for travel. 2) the midi is hard as hell to setup... haven't figured out how to setup the midi so it sends and receives from my interface, not intuitive at all... found a tutorial that i'm hoping will help... 3) faders are very responsive, i'm kind of impressed w/ that.... looks like they used Alps faders. nice. 4) I'll most likely use SPDIF for now, and if/when I decide to record using it in the studio i'll just solo each channel and track em in separately (the ghetto way lol). The ADAT cards would be around $200 a piece, and i'd need a new interface to even consider each channel going into the AI separately. Not the type of surprise build i can handle right now.
I'm goign to keep updating this thread as I go.... b/c there isn't much literature out there on how to set this up since it's 1) old, and 2) discontinued. Looks like it could be a gem though from reading about people who've actually used it. Most comments that is sucks are from people who have not used it.. but have used Behringer products and are familiar w/ their method of replacing quality parts with crappy parts and sticking their logo on it. But from the few who have used this... they say it's actually a great value and there wasn't enough difference vs. other boards of equal capabilities to warrant the price.