I've had them for 8 month now and no CEL.. as far as reliability.. I got them from a forum member here.. I'm not sure how long he had them but they still work.
As far as amber look.. I think that ambers look great on red cars.. black cars looks better with tinted lights and silver look AMAZING with those altezza all clear lights. Mine looked old and faded and these tail lights makes the car look "fresher"
Sasha
PS: Yellow boxsters look good no matter what