At about £90 less than current OCZ Vertex 3 256GB prices and benchmarking in some cases faster, this seems like a deal to me!
Also available from Crucial directly for £360 with 7% (£21) Quidco, that was the cheapest price when I checked a few days ago, though some other retailers are now pretty close to Ebuyers price.
I know it's not the out and out fastest but it's hard to find any 256GB SSD's for this price let alone a fairly high end one that's only just been released. Works out at £1.27 / GB.
"The M4 still isn’t as cheap as Kingston’s SSDNow V100, which remains the best budget drive on the market at £1.17 per gigabyte. But if you’re looking for an affordable SATA 6Gbit/sec model with cutting-edge transfer speeds, Crucial’s M4 is a high-performance hit." - PC Pro
First deal post :P
..and yes I bought one :)