I have a couple of hydors and absolutely hate the stupid ceramic shafts on the impellors.I like to clean my powerheads every couple of months but every time i go to take the cover off to clean it I seem to break them. One of the hydors I'm not using anymore because i refuse to buy a new impellor and the other I don't dare take the cover off of. I'll never buy them again, they're a piece of junk as far as i'm concerned
I don't have any experience with the nanostreams but the turbelle streams that i have I just love for the ease of cleaning