I've heard of it, but somewhat wary of it. At this moment in time, I don't have the resources to buy new components if I fuck something up. Hell, my resources are so low, my gaming rig uses a damned 2.5 GHz Intel Celeron processor and 612 MB of DDR RAM.
Maybe when I start earning more than £6.25 an hour (i.e., when I finally get my ass into the RAF), I'll look into it. But it's more likely I'll just buy a high-end system and stick with that until I need to upgrade.