I had a set of them, lasted 6 months.
The color is awesome, virtually no blue, and bright as hell.
The sylvania silverstars are just about as bright....lasted about 8 months.
I'm now running some no name -parts store brand H4's.... not quite as bright, but going on over a year now, and not one burnout.
If you can get the PIAA's at a discounted rate, I'd say go for it, but they usually run 60-80 for a set around here.
Also be prepared for them to not last very long.
So to sum it up....as far as performance, they're top of my list....
As far as longevity, ....not so much.
(your results may vary)
These are the ones I had:
OEM Sealed Beams:
PIAAS (in H4 housing):
Difference (before aiming - stock on Left, PIAAS on the Right)