help!

Been out of touch with PCs for ages but is finally got to the point I need a new one, this ones done well for about 11 years now but its getting to slow on ebay/facebook lol

so I found this one on ebay, but dont want a complete dud...

http://www.ebay.co.uk/itm/2209870702...84.m1423.l2649

What do you guys think?!

Ta