Anyone tried a pump with built-in filter?

Given the need to ensure clean filtered water to the nozzle has anyone tried a pump with a built-in filter like this one?
http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=380179340326

It pumps 5678 lph and has a built-in filter cartridge. I asked the vendor and they said the screw threads are standard pipe thread to suit normal PVC fittings.

I was considering buying this Resun King 5F 6000 lph for $89
http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=170390413779
then I noticed the above pump for the same price with similar capacity plus a built-in filter.

For future reference once the eBay ads have disappeared I have copied them here:
http://www.schoolzonelights.com.au/fountain/bestwaypump.mht
http://www.schoolzonelights.com.au/fountain/resunking5f.mht

Here's another link for the filter pump. The eBay ad calls it Bestway but I think it is Flowclear brand. Google Resun King 5F for that one
http://www.justsportandleisure.com/Details.asp?PID=17866

No, I haven't tried one of those. I was planning on building my own type of filter. It looks very nice and would be a good idea to have everything in one place.