I love LEZYNE! Going ALL THE WAY BACK to when the owner was building bikes! Fast forward to his latest endevour. I used the first generation SUPERDRIVE,and on the whole,was very impressed with the performance. Like all NEW products,it did fall short in some areas. This time around,and taking INPUT from riders like me,they really STEPPED IT UP. The QUALITY is....SECOND TO NONE! But for me it's greatest asset is,the ability to switch out the battery ON THE FLY!! When all your buddies are having to HEAD BACK HOME cause their light is getting low. You can ride til ALL your batteries have run out! What a BRILLIANT CONCEPT!!