<FONT face="Comic Sans MS">I have installed the Snake Oyl unit and can say that it is a quality product. The directions are a bit lacking though a phone call to Snake Oyl clears up any ambiguities.
The unit installs easily and has a wireless control, so no firewall *********** is required. Holds speed very accurately and will cut out if the clutch or brake is depressed. The most difficult part is getting up the nerve to splice in the 6 wires you need to connect into you engine control harness.
I posted some pictures a while back, which you should be able to find if you do a search. Feel free to e-mail me if you need more.
Oh, one more thing. This is your only option. As far as I know, Snake Oyl is the only provider of Viper Cruise controls. </FONT f>