I have one somewhere. The old see-through model. The black border around the screen is missing thanks to me throwing it at the wall as a kid when I sucked at Killer Instinct and kept losing all the time. I dunno where it is at the moment, probably in my loft somewhere in a box. I use my Cyclo to emulate old GB/GBC games these days since they're all but impossible to find.
I have it and it works. I really don't use it anymore, though; the only games I played on it were Pokemon (and I lost my Silver cartridge, broke my Yellow cartridge, and only have my Crystal cartridge left).
Still, the Gameboy is a great device. It was built so well that most of them work just as good today as they did when they rolled off the assembly line.
I may one day have to start buying all the great Gameboy games I've missed out on. Emulation just doesn't cut it. Tetris, Oracle of Ages/Seasons, etc.