Buying a Macbook Pro from Amazon? Experiences?

[iTootyFrooty]

I was looking at buying a new 15" Macbook Pro from Amazon UK, where they are offering the bottom tier model for £1250 (RRP is £1500 for this model). Just wandering as to why it was so cheap? I'm pretty sure it's not a scam because it's sold by what looks to be an electronics merchant with plenty of positive reviews on it's products. The product was sold and backed by Amazon a few days ago at the same price but I think they ran out of stock.. Do any of you guys have any experience with buying Macbook Pro's on Amazon? What would be the difference (Apart from the price obviously) between me buying this on Amazon UK and buying it in the store? I myself have only used Amazon for a few cheap purchases (Books etc), so I don't really have much experience with things that cost this much on it.