The DiNotte 200L is awesome, I knew it was going to be bright but I didn't think it was going to be like strapping a car headlight to my bike. There is no comparison to my old Cateye HL-EL410. I do have a question about the water resistance. Can it take a long ride in the rain?

yep.

yes it can. i was doing several hours in solid rain with it. no problems.

The battery pack may get wet, but it won't hurt it. Just take it out of the bag and dry it out after the ride.

I wrap a pair of rubber bands around the AA batteries and holder. I've had a battery pop loose a few times.