I had one a LOOOOOOOOOOOOOOOOOOOOONG time ago. Pretty decent filter with the built heater, leaked a bit. I don't think they make them here any more though. I would say get a Rena XP4 or an Eheim 2215 and 2217. But that's more money.
The Tetratec filters have been discontinued. I have a pf150 that is basically brand new (used once) with the 100w heater. It needs an impeller or to have the original one fixed (Krazy glue maybe?). I'll let it go for next to nothing, if interested.