I tried playing several different games with them and found I prefer the regular discs. The joystick work, but I found that sometimes they get stuck or feel awkward. I couldn't finish even the first screen in Donkey Kong. I then swapped the control discs back in and immediately ran through the first four or five screens without losing a life!
Conclusion: I wasted $6 plus shipping. I guess those Intellivision controllers aren't so bad after all!
Edited by ls650, Sat Feb 4, 2012 9:43 AM.