the restart issues are a common complaint about the quiet ones. If you are in the process of looking, eheims are good ones (as mentioned). I also really like my OceanRunner 2500. Very reliable and is only 38 watts for ~600 gph. It runs silent. It is comparable, IMO to the eheim 1260 but has less watts (= less heat added) and costs about 1/2. I have both the eheim and the OR and like them both.