Cons: I get about a year out of a set,(original SS's less time.)
I've got these in both Hi and LO beams on a Buick Le Sabre,with a relay to hold the LO's on with the HI's. I also use them in the main beams and fog lights in a Ram P/U. Both vehicles have additional halogen fog lamps,and the Ram also has a pair of long range driving lamps behind the grill with relay actuation. It's never dark in front of my transportation! On many runs from Denver to Roswell round trip,they are phenomenal improvements, and I will keep them until someone adapts HID for my vehicles.