Can anyone tell me their experiences with this pump? I just hooked one up today and I'm *really* disappointed. I don't know if mine's defective, but the thing is quite loud (like an electric can opener) and it runs hotter than hell. Most importantly, running this pump inline I get no better temperatures than I had with a submerged Rio 180!! Clearly the water is moving faster, but I think the heat imparted from the pump is negating any advantage from the increased flow. Another possibility is that my small radiator just can't take advantage. Oh well, back it goes. Think I'll try an Eheim with less power. They're supposed to be quiet and cool runnin'.