HAPP CONTROLS
   Four Competition Joysticks
   28 Pushbuttons with Horizontal Microswitch (Assorted Colors)
   Four Pushbuttons with Horizontal Microswtich (1,2,3&4 Player Start)
   3" Highball Trackball
   Trackball Mounting Plate
OSCAR CONTROLS
   Model 2 Spinner
HAGSTROM ELECTRONICS
   KE72 Keyboard Encoder
   Two IOX36 Breakout Boards
   ME4 Mouse Encoder
The Competition Joysticks very closely resemble the feel and response of the joysticks used in most fighting games. All the pushbuttons are the normal concave pushbuttons. The 3" Trackball is excellent. It is extremely smooth and accurate. Definately worth the $100.
The Oscar spinner is very nice and well made. It works great and I recommend getting an Oscar spinner to anyone. I believe that you can no longer get the Model 2 spinner from Oscar anymore, however he does offer newer models.
I believe I choose to go with Hagstrom Electronics instead of an IPAC because at the time, Andy didn't offer an IPAC version with enough inputs for my control panel. The KE72 does 72 inputs with no ghosting. I opted for the Breakout Boards to make the hookup easier. I also go the ME4 mouse encoder, which both the trackball and spinner are both hooked up to.