Just a slight word of warning - i have two pc's (one as main workstation and one as renderslave) both decent spec. Updated both to windows 10 last night - the renderslave (i7 2600k + GTX580) worked flawlessly - everything working exactly as it was before, all software + plugins etc came across great. But, on the main workstation (i7 4930k + quadro k4000) there were some serious issues - max wouldn't load up properly, autocad didn't even open (missing .dll), google chome crashed on startup, and all photoshop plugins were missing!!!! Completely unworkable! Luckily there was an option to roll back to win8.1 which only took about 15mins and everything was back to normal before the upgrade.
After a bit of googling, i think it could be to do with the nvidia drivers, but not 100% clear on the problem or if there's a solution on the way. Bit concerned as the rollback feature is only available for the first month after win10 release which would mean if i attempt it in 6 weeks and all those software issues are still present then i'm pretty screwed.
Anyway, if anyone else has had similar problems or a solution to it, please share as i'd really like to upgrade asap.
Stevie.