I'm sure you know what this is. It's a fantastic machine, and this one is in great condition and kept in a smoke-and-pet free studio, and is fully functional with PSU but no box.
The bubbling and scratching on the screen is for the peel-off screen protector rather than the screen itself.
These days though I'm playing rather than sequencing drums so this hasn't had a huge amount of use and I have limited space in the studio!