i had smoked ones about 5 years ago, they looked good on the black car, but at one point i felt that they looked too "chinese", and when couple of months later one side stopped working, i just took them off and sold them on ebay for about $70... There were too many cars on the road (San Jose, Costa Rica), that had those altezza-style, LED tail lights... I think in 5 years the technology should be much better and the warranty should be good too...

Also, these lights are known to flicker on the start up for the cold monitoring and also continue to flicker while on - supposedly due to adaptive braking on the facelifted E53.

There is a line in the FSW programming file that calls for LED TAILLIGHT ACTIV or NICHT_ACTIV, which hopefully may resolve the flickering issue.