They are very well rated. Often there are coupons through parts retailer that makes them excellent values.
Most resopnses to PIAA is that they are over-rated and too expensive. Hella makes good bulbs but again very expensive.
What ever bulb you use, be sure not to touch the glass with your fingers. Even the tiniest amount of oil from skin can cause an uneven spot that will make the bulb burn out.
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)