I have a Sony VAIO VGN-FS315E laptop
It's great i have had it for 2 years and it is still going strong. It can be a bit slow to boot up sometimes, freezes sometimes but nothing that makes it too bad.
It currently has 512mb memory. it can take 2gb and I found out that this would cost c£50 to get the max 2gb memory.
Anyway - would it be worth it to add to the memory? would the performance really be a lot better?