I bought my Jebao 12000 DC back in Oct. 2014, I think the most maintenance I've done on it was took it apart and rinsed it out when I switched sumps couple weeks ago. It's still going strong with no issues.
I bought 2 Jebao RW-8s in Feb. 2015, haven't done any maintenance on them. Working fine.
Bought my Jebao DP-4 in April 2015, Calibrated it when I got it and haven't touched it since. Pumps don't seem any louder then they did when I got it, Its only like 3' from my couch and can't hear it over the TV.
I'm not saying Jebao are top notch high end quality equipment but I think they have been well worth my money.
Seems like I've heard better results from people not cleaning there Jebaos. lol.