Looked at the offerings from Philips.
I think good bang for buck, especially from the dynamo version although its not as bright.
The aesthetics didnt grab me so I went with the polished alloy Edelux which I love to bits.
I did buy the Philips dynamo tail-light though which I'm over the moon with, called a Lumiring
http://swhs.home.xs4all.nl/fiets/tes.../index_en.html
I'm not interested in a p'ing contest with others in here so will simply say I'm pretty forgetful so batteries dont suit me.
My set up of Son28, Edelux and Philips Saferide Lumiring suits me mighty fine and I cant see any need, reason or current upgrade to tempt me.
Happy Spinning