I have a yamaha P85 down in my basement that unfortunately doesn't work anymore, and the parts I need to fix it are no longer available. I just haven't been able to bring myself to throwing it out yet. This model has been out of production for a while now. When it worked it had a pretty good keyboard feel, as a midi controller it was limited but if you're only looking to do Piano Tutorial
voices it is adequate (it won't do Layers and splits, and sends on a single channel at one time). If you can get one in working order a a bargain basement price go for it. Don't spend a lot of money on one though because if it fails you may not be able to get some of the parts needed to repair it.
Yeah, since I don't hear about Yamaha P85 anymore, maybe you, or anyone out there planning to buy such digital piano, I guess you need to check first if last long enough that they can also supply with the parts the you'll might need in the near future.