I have 4 RW-8's. I shelved them for an mp-40 and gyre 150, then decided I wanted more randomized flow so went to add a couple back in. I knew one didn't work, come to find out 3 of the 4 don't work. 1 doesn't turn on, 2 turn on and then stop turning within a couple minutes. 1 works like normal. One of those 4 is a replacement from one that died within a couple months.
I do have a wp-25(I think?) that I bought way before those rw's and it still works. I have a jebao doser that has worked great for 18 months, and a jebao dcp return that I've only had for 6 months.
~50% failure rate for me.
I think after my recent experience trying to use my rw8's again, i'm through with jebao powerheads. So far, i've had good luck with their other products.