There is a real problem with the control screen.  It does not light up when you touch it.  The words for Open, Close, Start, Stop, etc.  are next to impossible to read .  It seems like as much as it costs, it would be simple to have a touch sensitive lighting feature like the oven and refrigerator do.  It could go back out after a few seconds.  But as it is the only part that lights is the screen for the time and function.  This is a poor design.  Maybe you could create a simple stick on overlay with the control buttons easier to read, as the white lettering on the black background is faint and appears almost gray.  The next issue is that cleaning the inside of the top is nearly impossible.  You have to contort your arm to get it in there, and then try to peer into the device from pretty much the floor to see if it is clean.