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Ask yourself how much you're gonna save. I'd spend a bit more to make sure I was getting good memory from a reputable source. It's not worth your time to install, uninstall, troubleshoot, and return if there is a problem. I can guarantee they won't pay the return shipping, and a 100% guarantee is only as good as the company that backs it.
 
a bit more is £30. A lot in my terms, but maybe you're right about it.
 
Bought an OCZ Value 1GB from Microdirect (± £76), haven't got any problem with it on my MBP C2D.
 
No! Bad RAM is the easiest way to cause instability in a Mac. I bought some RAM that caused my iMac to kernel panic and crash constantly. Mac OS is just very picky about RAM.
 
Once the ebay seller has your money and you've left your positive feedback (or 90 days have elapsed) anything he says on the ad has absolutely no meaning.

That includes the warranty, it means nothing.
 
Remember, "Money Back" most often does not include shipping either way, so you could be out $10 - $30 and have nothing to show for it. Some eBay vendors will also ding you restocking charges, eBay listing and PayPal fees if you want a refund.

Why buy on eBay when there is a wide range of reputable dealers to buy from, who offer Mac copatibility guarantees, and no-charge (no shipping, no restocking) replacement or return if it doesn't work?
 
hmm im always wary of ebay, but this may just be an OEM version of some brand. You should probablky shoot the seller an email
 
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