As someone who has ridden Ui2 for a full riding season, I say, if you can swing the extra cost of it...go with electronic. I have not had a single problem throughout the 8,642 miles I have ridden this year...and I am not joking! I could not be any happier with the performance of Ui2. It is smooth, precise, quick, and quiet. And for someone with hand issues such as myself, it has been the difference between riding and NOT riding...well, more specifically SHIFTING. I jumped in blindfolded...never even test rode a bike with it, yet chose it as the drivetrain on my custom Ti Seven that I had built last winter. No regrets at all. But if you're unsure, go out and test ride a bike equipped with electronic and see for yourself. BTW...I have yet to run out of juice on a ride...and I do long endurance rides (50-100 miles) too. I think I have only charged up the battery 3 or 4x the whole riding season...only takes about 2 hours for a full charge, easily done overnight. Plus, I have my battery indicator mounted up higher near my handlebar, so that I can keep an eye on the level...but most of the time, I don't even worry about it.

Linda