I just got a couple of the TLF reactors a few weeks ago and I haven't had a bit of problem with them. I'm not sure exactly how something COULD go wrong with them, unless you got a leaky or broken one. Super simple to use and if you find you don't need to run GFO or GAC you can stick virtually anything in them! You could probably even stuff some rock rubble in them if you wanted for more biological filtering. For $30 + or - I don't really think there is a way you could go wrong with one IMO.