Ram for macbook 4,1 - please confirm if this is correct!

Hi everyone, I think I have found a decent deal- does this RAM look appropriate for my macbook 4,1 (needs PC2-5300, 667, non ecc unbuffered 200 pin sticks... all are a match, but is there anything else I need to take into consideration, aside from the fact that it is used and may not work?!
http://www.ebay.co.uk/itm/2GB-Kingston-DDR2-667-PC2-5300-Laptop-Memory-RAM-KTL-T P667-2G-200pin-/321035770000?pt=US_Memory_RAM_&hash=item4abf391890&autorefresh=t rue

You should consider that sometimes even though the specs line up Kingston ram might not work well in your Mac. You need to look at Crucial before you purchase used ram from eBay. Crucial is 100% guaranteed to work and they have great customer service if you ever need them. OWC is also good. Personally I would stay away from Kingston and eBay. I also believe that you'll fine Crucial to be less expensive.
http://www.crucial.com/index.aspx

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