Dang those are some expensive gloves. I'm going to be straightforward here. If you buy $80 winter gloves, you are wasting $70. Then again if you want to necessarily pay for a brand, then why not, go ahead.

What you should do instead is
1) buy a pair of mechanics gloves and some H&M polyester thin gloves. Use them together. Those will be good at -10 celsius
2) buy a pair of the cheapes downhill skiing gloves you can find. They always break anyways so why spend money on something that's going to break anyway. Make sure they're nice and thick. Tose will be good up until -20 celsius
3) Buy a pair of thick mittens for the extreme cold. I have the german army mittens which could probably handle -60 celsius easily. Not much finger dexterity for brakes, but if it's so cold you have to use mittens, you're not going to be going so fast as to really need brakes. No, seriously, a bike will stop on it's own very quickly in those temperatures if you stop pedaling.

The good thing with the thin polyester glove is that you can always take the overglove off and ride a little while with the thinner glove. Your hands wont get instant frostbite but you won't be too warm either.
Take it from a dude who has lived 25 years within or near the arctic circle. Layering is key in cold and especially in the wet. Several cheap layers always, ALWAYS beats one expensive layer.

Put the money you save in some merino wool thermal layers or something.