the original & the best is here:
http://www.crutchfield.com/S-PRaqg85BiGb/cgi-bin/prodview.asp?I=505RB103
LOTS of valuable uses... the flip up plastic cover is cheesy.. I saw those at Autozone & just giggled/shook my head.
the varad RacerBoy shift knob is all machined aluminum. the buttons are recessed. All 4 buttons can be configured as latching, momentaty, push/release.. or any combo... if that last statemnt is French or Alien language to you.. then installing the knob & wiring it is beyond your scope.
In street rods & custom cars, we have used them for windows, A/C, Stereo Wireless remotes, neon lights, Nitrous Systems, wiper controls, sunroofs... anything imaginable that is 12v powered... a few relays.. anything is possible.
One car, we have the set of 4 buttons working 16 different fucntions based on the position of the iginition key, the Nitrous arm switch, & the stereo mode setting... One layer is Nitrous/Stage/Line Lock. Layer 2 is windows/sunroof. Layer 3 is alarm functions (key off), & layer 4 is default (stereo remote functions volume, track, source)
So in our experience that the GOOD knob (Varad) is very valuable.
just our .02...
ROb W