Has aybody used one of these universal power windows kits?

POWER ELECTRIC WINDOWS UNIVERSAL 4 DOOR HEAVY DUTY - eBay Car Alarms, Safety, Security, Car Parts, Accessories, Cars, Bikes, Boats. (end time 16-Oct-09 04:00:56 AEDST)

SPAL UNIVERSAL POWER WINDOWS kIT (BUY BRAND QUALITY) - eBay Switches, Controls, Interior, Car Parts, Accessories, Cars, Bikes, Boats. (end time 12-Oct-09 18:35:11 AEDST)

or anylike them? i was thinking of buying a vt without power windows and getting these installed.. does anyone know if i would have to buy anything else to do with the door or is that all i need? and how much would it be to get installed? thanks