Jebao DC12000 here. Running a bit over 2 years now. Bought it used, so far no problem. For about a year I ran it at almost 100% for return and T-d off to feed the algae scrubber. Now I ran the algae scrubber with it's own DC4000, so the 12000 runs only for return, at 4 lights (I think about 60%).
As a backup I have a DC6000.
I have a Vectra and a simplicity rebranded jebao pump from aquarium depot. Bought it because it seems that simplicity has decent warranty support and Hussain from aquarium depot seems to back the products he sells.Hopefully its more reliable and if it does die I can get a replacement or parts.