Planet Bike Borealis Winter Gloves:

Pros

The 2- finger combo portion (mini-mitten) for the pinky and ring finger actually has a soft divider (glove- style) inside. Since you never need to use those fingers other than for grip while riding, they stay stationary, and usually cold, but not with these gloves.
The 2-finger split (glove portion) stays warm but allows for important mobility of the index and middle fingers for breaking. The thumb is a given- even mittens have a thumb, but this feels natural and not stiff, like some mittens can be.

Cons

The wrist portion, while secure, could be a little longer. I have a pair of gloves that are 10 years old which have a large wrist gaiter. I don't think planet bike needs to go that far, but perhaps another inch would give a better wind buffer. Simple solution for me is just wear layers, and have one with longer sleeves that goes over glove a bit.

Other Thoughts

I've worn these in 1 degree Fahrenheit weather, and as long as I'm moving, I'm comfortable. These are certainly the warmest gloves I've ever had for riding, and even shoveling or other activities like a cinder block workout outdoors in cold weather, these are perfect.

I have not tested the water resistance, but I typically move up to not-as- warm waterproof gloves when it hits 35/40 and there is an opportunity for rain or slush. These gloves excel in the sub-freezing zone.