How much did you pay for it? Yeah, those things are really cool, and a good alternative for people seeking complete GS compatibility while retaining the best possible sound quality. Only difference would be 8820 versus 8850 - which you already have.
I paid 350 US plus shipping (another 50). I got it through a friend on eBay who sells a bunch of vintage synths.
I really bought it for:
a. digital capabilities
b. external sound card
c. a + b in one device
And yeah, I just got my brother to ship me my 8850, so I'll be able to do what I originally intended- sequence/edit MIDI using the 8850 and the ease of use of the LCD display, but then change output device to the 8820 (or SC-D70 as it turned out).
I just hope it lives up to my expectations

So how's it working for you right now? Do you like the sound quality in the digital aspects? Oh, and BTW - I like your policy of "buy now, ask later."
It only shipped about 2 days ago, so it should be here in the next week (as should my 8850).
As for buy now, ask later- I got a special deal so I had to act quick. I mean, there isn't really any reason for me not to have one- it'll be very useful and neat, I think/hope, and if there's problems I can turn around and flip it on eBay.
Naturally, I'll post some samples/comparisons and such when I get my stuff. I also sent my cables over, but I might upgrade some of them seeing as how I get a RadioShack discount.
- Alistair