to answer your question...
.. i have Sylvania silver stars on my GMC 2500---
I was able to compare them to halogens because the high beams are separate from the lows. So with that , I just changed the lows and the difference is substantial...switching them from hi- low beams - very nice super white light from the SS's.
So the answer to that is--- Yes, highly recommended
1978 280 CE silver
1986 560 SL black
1987 300 SDL cream
1994 SL 500 brilliant green
1997 E 300d dessert silver
2005 FORD F250 Superduty Crew cab 4x4