The FM receiver itself works pretty well and picks up the local radio stations clearly. The biggest problem I have with the unit is the digital tuner. There's no display telling you what channel you're on and the only way to select stations is to hit a button that auto scans to the next station. When you power off the Gameboy the unit will forget what station it was on so you'll have to scan your way back. The reset button takes you back to the beginning of the dial so if you've scanned past the channel you were aiming for you can give it another shot. There's a switch for the volume giving you three settings for the volume.
Overall this is an interesting idea. Twelve to thirteen years ago when this was a marketable product it was a pretty good idea. Portable media players were pretty much limited to tape and CD players which would eat through double A batteries and would be a lot harder to carry around along with your Gameboy Color. So having a tiny music add on might have been appealing to many a gamer stuck in the back of a car. However the included ear buds are complete junk so you'll have to use another pair of headphones. I bought this on ebay for a whopping dollar and do not feel ripped off at all and feel that it does add a nice feature to your Gameboy Color.