Only one left at the time of posting. This is about half the standard price. I have just bought the next size down for what I thought was a great price of £59. But my tank is too small for this filter anyway - plus I don't quite have the space for the 522.
Interesting features; can be placed beside or behind the tank, not just below. Three chambers for mechanical, chemical and biological filtration, filter media, including ceramic rings, is included. Priming is simply done by filling the filter through the top. An optional heater can be fitted to the filter so it doesn't need to be in the tank itself.