When asking how long people have had the DCT, or what issues they are having...you have to keep in mind this pump is pretty much fresh on the market.
Sure the Jabeo DC's have been around for a while, and have a spotty at best track record. But the DCT's have only really been around for what, maybe 6 months? I am not sure if it makes sense to try and guage the DCT's based off the previous DC generation. I just don't know, maybe there is some common issues, but I think it's just as likely that they will have a completely different set of issues.
They may be similar, they may be worse, they may be better...it's really hard to know at this point...
FWIW, I have a DCT6000, and it's super quiet. So far I have had no issues (but like I said, WAY too early to tell). I definetly have a spare on hand and am ready for a failure at any point. You should be too (with any pump!).
If you want to be more confident in your pump, you definetly have to spend more. I do think the Deepwater's BLDC pumps look very interesting, but again, another pump that is brand new on the market and yet to be proven (although I think it has every indication that's a quality pump, if it was smaller in size I absolutely would have gotten one over my DCT6000).