Raid 0 on Vaio Z is it worth it?

I'm about to take the plunge and order the vaio z from sonystyle uk, i was looking for the fastest, reasonably portable with good resolution laptop, and while I was looking for screen little bit bigger than the vaio z (15"-16") I couldn't really find anything that would go as fast the vaio z while still being under 17" and light enough to carry around. But all my searching was based on the fact that I want to raid 0 two fast SSDs.
But is it really worth it? will two x18-Ms in Raid0 on the vaio z raid controller be really faster than one x25-M?
Also is it possible to DIY the raid? I did some reading and while I found some threads talking about the parts used to do the raid i couldn't get a clear answer whether it's easy to do the raid yourself.
One other question is that on sonysyle uk you have the most expensive vaio z having the carbon fibre option, while anything cheaper doesn't say so, does that mean the others are not carbon fibre? how different would a carbon fibre vaio z be VS non carbon fibre?

Thanks

 

Re carbon fibre, they all are (or aren't, if you're a purist and reserve the word carbon fibre for carbon fibre weave).

The difference between "premium" and regular is the finish, nothing else. The premium has a brushed finish that makes it sparkle blue more visibly when caught in certain light angles, but it takes scratches more easily too.
Ironically, the blue sparkle is a telltale sign that the lid isn't real carbon fibre, but plastic containing milled fibres.

 

I have already ordered the raid 0 cable and the frame to hold 2 x 1.8" SSD. These are very cheap in China.

I am just waiting for Intel X18-M 320G to be stocked by some retailer, then get a pair to test the performance of a 640G raid 0. If the performance is not satisfying then I'll just RMA them.