I would like to see a discussion about EBike Regen features. I like to ride my mountain bike in mountainous terrain and I can't imagine that any EBike battery could last for 3 or 4 hours out there. Since I spend a lot of time going downhill it seems like having an EBike with regen is a must have requirement. Regen works great in my Prius, but from some of the forum posts here it seems like regen on EBikes is not well developed and not really worth the unsprung weight and other disadvantages. What do you think? Is regen a feature worth having? Is regen a feature that has room for improvement on EBikes?