I have a problem with paying $50 for something that is completely conditional on you having membership.
Why not allow limited access? I mean you get 1/6 of the game for free, then pay 50 for the other 5/6 but can only ever access the full game when you are a PS+ member?
I mean I never intend on letting my PS+ membership expire so I would never be locked out of the other 5/6, but that won't be the case for everyone.
There should be anohter option to pay for the rest of the title if you wish to let your PS+ membership lapse.
As it is I'll download this game but if I like it I'll either buy it, or wait until it goes on sale. I'm not a big fan of racing games, and certainly won't be putting myself in a scenario where I could potentially pay $50 for something and not have access to it.