Right now I just want to go play on a yamaha upright with a practice mute. 
I cannot deny that the mute function is handy. Without it my time on the piano would be really limited due to living in an apartment and working late often.
But I find I use it less and less lately and this has actually affected my practice time. I often just feel that if I cannot play "properly" then I don't want to play at all. It is good for learning the notes and fingerings, but I feel like I still need to relearn the passages with the "real" piano sound. Also the keys do feel a bit different when playing mute, so the touch changes as well.
I think this maybe be depending on what your focus is. I have learned things about myself lately. I really don't care whether I learn to play difficult pieces or learn to play fast. I am obsessed with the piano sound. I can spend ages with a piece just trying to get the perfect sound. Playing with the mute digital sound doesn't do anything for this, so somehow it feels like a waste of time.
If I lived without neighbours, I would never play with digital sound again. I have just decided to get a cheap used piano to my summer house. It's literally in the middle of the woods, so at least for a couple of weeks in the summer I could play as long as I wanted any time of the day (night)
