I bought one of the early units in the USA. It is Serial EVL1A001422 (the number 1 after the EVL may be an I). No problems other than a few worn out key caps. I have no idea how many hours it has been played. It is used every day, including student use.

My second unit is at a student's home. Bought it used. Don't have access to the serial number for that one. It works perfectly and actually looks better than the one above. I have had it about six years.