NN version all the way ...
+1 for the NN version ...
+2 for NNs service!!!
I changed the tail light of my 2006 12GSA for a 'design' model when NN released it, I'd been blowing rear bulbs (due to vibration of the tail light unit) regularly, so wanted a LED version.
Installs to the bulb socket (so reversible easily), solid mounting, very bright, nice design and most importantly does fool the canbus into thinking its a bulb, so no warnings.
After 18 months installed, I noticed one evening that one of the strips of LEDs had given up, surmising that it must be a fault in the board or paths (not a single LED fault), I dropped NN a line about replacement ... they returned the email overnight, stating that its guaranteed for life and too return the item.
I returned the old unit and by return of post got a brand new board fully packaged, fitted again in 10mins and working like a champ again ...
Design model ...
http://www.nippynormans.com/prodinfo.asp?number=LLP-1010502&variation=&aitem=9&mitem=11
My fault after 18 months ...
http://cinnabar.smugmug.com/gallery/4809413_GDLJm#285832006_oULH3
http://cinnabar.smugmug.com/gallery/4809413_GDLJm#285833277_v34Db
So, are they bright, yes (especially as I went for the indicator brake lights as well!) ... I bl**dy hope so, will move some of the tailgaters away on the M4 ... would I buy from eBay, maybe, but what about return and do you want a fault light on the dash, I don't, I might miss something important ...
... buy from NN, definitely without hesitation ...
HIDs up front, NN LEDs out back ... great combination!