In Summary.

I've been very pleased with the result of the build. I love this drive caddy, it makes things so much easier.
The main thing I've needed to do is be a little patient with RAID. Not that it's not faster than single drive, or safer for that matter, just that RAID needs to do finish what it starts before you hammer it again.
Example: whilst installing am application (Picasa2) I got a BSOD and the RAID reported a failed drive on installation. RAID started to rebuild and I gave it a hour (which isn't nearly enough time!) before trying again. This time, another BSOD and again a RAID failure, this time a different drive! Needless to say, the RAID array had failed by now as it had lost two drives over a short space of time before the first rebuild had completed.
In the end I rebuild the RAID and reinstalled - this time, touch wood, I've had no BSOD at all!