While not the 10000 model, I just installed the DC-3000 on my 90gal as a return pump. First impressions..it's extremely quiet! I always hear of people say "I had to touch the line to see if it was running" and that is exactly what happened even at full speed.
It's fairly small pump in size, fits nice in my 20gal sump where I used to have an Eheim 1260. I've got the pump dialed back to 3 bars and it's running great. The connection is quite long from the control pad to the pump, so it could be mounted quite a ways from the unit.
Granted I've only had it set up for about 3 days, but so far I couldn't be happier with it. If I'd had known about this pump, I would have ordered it instead of my MAG5 to run my AquaC skimmer (and I may still).
Time will tell in terms of reliability etc..
Shaummy