Jennings RJ1A - $174.95 Gigavac GH1 - $124.95 Greenstone VHC-1 - $89.95 Kilovac HC-1 - $459.91 Ok, they are all the same exact specs, and all are available with either a 12 vdc or 26.5 vdc coil. I require a dozen of em for a specific application. Are the greenstone VHC-1 any good ?? Jim VE7RF