I have tried it
But only in a virtual machine just as a test run, thing is pretty quick to install on an SSD I think it took like 5 minutes to install where as normal Win 8.1 pro took me about 10 minutes, so this industry copy took about half the installation time roughly.
Boots pretty fast and is about 8gig roughly installed, Its nice and zippy however I have not fully moved over to it or running it off full on hardware since its under a VM.
While it does appear at first to be faster and better it could just be that clean set up vibe, I do reckon once I install my firewall and anti virus and drivers it may just act like every other windows 8.1 and slow down but its just a theory, considering I can't use my Windows 8 key I don't think ill move to it full time.