I've already purchased and returned.
It's not bad by any stretch - far from it. If you are an F1 die hard, you just simply cannot find this feature set (or anything even close to it) anywhere else - every car, every driver, every track, weather, super deep career mode, all the rules (practice sessions, qualy, SC, VSC, on and on), somewhat believable but fun mini games to keep you entertained during practice and engaged with the car development progress, etc. On top of all that, the game looks really great (and seems to be really well optimized) and there was nothing about the car physics themselves that really drove me nuts (i.e. no obscene levels of under/oversteer, over the top wheel spin, etc). I think for the right kind of player, this would be an excellent purchase that I could see someone playing very intensely until F1 2018 comes.
All that said, the key phrase I just used was "for the right kind of player"...I really don't believe I am that kind of player. You won't get me to say the physics/FFB aren't any good - I think they are more than passable (even good) for a simcade style game. But, for someone like me who really identifies as a "sim racer", they just left me feeling like something is missing. I personally find lapping in R3E's X17 and Automobilista's F-Ultimate way, way more rewarding. Relative to those games, the physics/FFB in F1 2017 feel like they are missing something...just a little "numb", I guess. The same oneness with the car is just not there for me, so I know I will never get my money's worth out of the game...hence, refund.
Now, looking to head off trouble/hurt feelings, please note what I did *not* say is "if you are a sim racer, you will hate this game" or "if you like this game you aren't a sim racer" or anything of the sort. I love that there is a diversity of racing games that all do different things really well...don't let me get in your way - please play what you enjoy and have a blast. It's just that my personal preferences as a "sim racer" are at odds with me being a regular player of F1 2017. I really did not anticipate taking the plunge on it until maybe next years summer sale, but I read so many reviews that seemed to imply that this year's edition was a significant departure from previous years titles from a physics/FFB standpoint, I had to try it. To me, it still feels very much like a F1 201* game to me...probably Codies best feeling F1 201* yet, but still not enough for me to sink hours into.
Just my 2 cents.