Have tried the silverstar bulbs including the Ultra and while they are a bit brighter and do a better job lighting the side of the road they just dont last long. The last pair I paid 50 bucks for and they had a rebate of 20 I think. One went bad before I got the rebate back and the salesman at Oreilly's response was (yea they are bright but they dont last long) Went back to stock
Second his opinions. Have also used Silverstars, and they do have reduced life. However I think they add a significant amount of extra light. My use has been with low beams.
One downside I have found is there is more glare in heavy fog while running them as low beams. Moderate fog isn't bad, but really heavy fog is.
