That's not for at least another four years though. OP - steer well clear for the time being, it's a complete cackshow.
I decided to grab the free upgrade figuring I could always just roll back to win7, so I prepped out the arse just to be safe - backed up all my files, downloaded copies of all the vital system drivers for both win7 and win10. I started at 9am yesterday morning, and only just now managed to battle my way back into a functional(touch wood) win7 install.
First I wasted hours trying to get the bloody upgrade tools to work and run the upgrade all the way through; next you have to dig in and try and find all the little hidden ways the OS is going to try and spy on you and disable them, those you can anyway; then you try and figure out how to not make it look like arse and find out they've inexplicably disabled the dark theme and the supposed regedit fix doesn't work, so you have to download third party themes, enjoy another wasted hour; then you find out win10 has some really stupid flaw that causes non-windows app programs(ie all the ones you care about) to have really blurry eyestrain-inducing text and spend another hour fannying about trying to fix that without success; and finally you say f-it and decide to roll back to win7.
But wait! For some inexplicable reason, rolling back has broken your network adapter! So now you have to spend another five hours ****ing about with USB sticks, diagnostic tools & drivers, and your crappy old laptop(for internet access) to coax it back to life.
If you really think you'll need the free upgrade(ie, if you intend to upgrade your OS before you next upgrade your motherboard, since doing that invalidates your free key for win10), trust me - take an image of your boot drive, run the upgrade-then-rollback process, and just immediately overwrite whatever twisted mutant you get back at the end with aforementioned image to save you the bother of trying to get it functional again.
I genuinely thought after a year win10 would be if not a welcome upgrade then at least a tolerable inconvenience, but I think now win7 will be my new XP and I'll just have to hope they get their crap together before they stop security updates for it.