I have the 400w versions on my DT and frag tank. Love how small the elements are. Makes placing them in sumps a lot easier and saves space. So far so good in the 6 months I have had them. Only complaint I have is I wish the controller came with some type of plastic bracket so I can mount on the wall with screws and not use the double sided tape that it comes with. If anybody knows someone that has 3D printed this part. Please let me know. thanks!