I havent had any experience of it Jon and dont know anyone using it yet.
To get the best performance out of it, as I understand it, then you would need a 64 bit OS such as the XP 64 bit one.
Plus suitable applications for a 64 bit OS, I dont think theres much software written for it yet.
Given that new technologies often take a few years to sort out the bugs along with the inherent ones in a new OS, then I would be very wary of using something like that, unless it was only being used as a test bed and you had an older reliable pc for a backup.
The latest AMD and Intel cpus using the well known 32 bit systems are as fast as anything that you would be likely to need for a few more years to come so I would personally go for something tried and tested rather than spend a lot of money on an unknown system