Never get a piano with a practice pedal, solely because it replaces the sostenuto pedal, which is a very valuable asset in piano playing. The use of the practice pedal is insignificant compared to the amount of benefit to be gained from the sostenuto pedal.
My piano has una corda, sostenuto and damper pedals. It has a lever for lowering the practice felt. I use the practice felt / pedal a lot. I use it for finger workouts - it demands a greater precision and power in finger action to achieve a clear sound, so the exercises produce more benefit. I also use it when my teenage sons are sleeping in and I want to do some note learning or basic chord or scale movements - I have to work on articulation later. I can practice a lot longer without my ears hurting, so I can listen better when I practice for performance qualities. I find I have to be very careful and selective in my use of the pedal because it can lead to heavy wrists and impreccise articulations.
My upright has a practice pedal and it is nice for practicing in the evening when my family wants to sleep. However, I agree with retrouvailles that the sostenuto pedal is more valuable. I could practice more effectively with the sostenuto and as it is, I have to practice certain music only at school (but then I get to practice on a Steinway B!). Does anyone know of an upright that maybe has the sostenuto pedal, with a lever off to the side or something separate to mute the sound like the practice pedal?
Does anyone know of an upright that maybe has the sostenuto pedal, with a lever off to the side or something separate to mute the sound like the practice pedal?