I got one recently. Pac Man plays really well thanks to the 4 way stick, probably worth it for just that if you don't have Mame machine or control panel with a 4-way stick. Pretty much an arcade perfect port (it's still a port, since the scores are on the side)

Galaxian, Dig Dug, and Rally-X play well, they got a few of the sounds wrong, but nothing major.

Bosconian sucks. 1. Bosconian is designed for an 8-way stick, the joystick is 4-way, so you can't go diagonal! 2. The level layouts are messed up (according my brother who likes the game much more than I) 3. There is no speech synthesis!

All in all, buy it for Pac-Man, get 3 games as a bonus, and forget about Bosconian.