I guess...for the used piano we should really try before buying? (or at least get a tech to try with you?)
But for new....i may trust the quality being stable for that brand and I would think buying new is more perfect condition? And if I try the display, then i know this model of piano can be like this so just a matter of tuning when I get the new? It won't be too far off?
Even pianos of the same make and model can sound quite different, and there is no guarantee one you haven't tried can be voiced, regulated, and tuned to sound and feel like the one you liked. Fairly close probably, but fairly close is not good enough for some pianists.
I agree—- and will add that the floor model will have been tuned several times, possibly regulated and voiced. Will save $$$ because of the prep.
Yes, I would agree with dogperson IF all the pianos on dispay in a store were all prepped. This is not always (or often) true. Therefore, for the 'normal' buyer (a not accomplished pianist) the differences between a sight unseen piano and a piano in a store would be not so clear, especially if we take into account that the sound of a piano can change depending on the preparation (and on who is making the voicing) and also it can change in the years or depending on the placement in a room.
The only thing I guess is important to check is the brand and the feeling of the keyboard. Once you choose a keyboard action the choice of a better piano is often a matter of good luck (for a not experienced pianist).