The first one of these piano/keyboards that I received had one very noisy key and one very stiff key, so that one went back for a replacement.
The NPV60 is £50 cheaper than the NPV80 but considering that you get the £20+ sustain pedal included, superior piano sound, more connectivity and other extras with the NPV80, it is by far the better buy. So I sent the NPV60 back and bought the NPV80.
Alas I have also sent the NPV80 back as that also had a noisy key and I have decided that I don't care for the cheap rubber buttons that Yamaha insist on using that don't always seem to work first time. I suppose they are cheaper to manufacture but I'm sure there is a better solution than rubber membrane buttons that you also get on the cheapest keyboard.
But on the plus side these instruments do have in my opinion very good sound quality both models having twin 6 watt amplifiers and if that is not enough power they can be plugged into an external amp.
On both models the keyboard itself is sufficient although I question whether the graded soft touch action really works, as I couldn't really feel much difference between the base and treble key action. I also question how much heavy playing the keybard could stand before the keys become noisy.
There are a number of very good sampled voices on both models eg Piano, electric piano, organ, trumpet, saxophone, and many more. Yamaha have also included a lot of gimmicky sounds such as running horses, gunshots, ringing telephones, sirens, etc the quality of which is abysmal and not needed on a serious instrument.
Overal the price is good for what you get (espaecially on the NPV80) I would reccomend either of these models for someone learning piano or for a player wanting a portable instrument for moderate use.