I am starting to do more night riding and really enjoy it except for my battery lights. Looking at other battery lights made me start wondering about dynamo's (cost and everything). The SRAM i-light D7 looks good to me because it has cartridge bearings and has the same or better efficiency as the Schmidt SON, but the reviews I found also said the resistance without the light was the same as with it on but these were from 2004/2005 or so. Any one have a newer D7 and can comment on it? This is going on my Rando/road bike not a commuter. Any long term problems with the hub that anyone has found? Condensation during cold weather? I will be using it rain or shine.