Aquael Unifilter 500uv Internal Filter

[fiskkeeperpro]

Has anyone used these internal power filters before?
Here is a link: the filter
They looks quite useful as they have an incorparated uv steriliser in them and have a useful 500lph and for my 12gal tank thats not to bad.
Let me know your views please, always better to get advice of here before buying anything...

thanks.
Will