Not all 4 seasons are the same. In my experience you really only need a 4-season tent where there is high wind. When I was a kid, I winter camped in northern Michigan with my father. We always just brought a tarp. There were no bugs... no need for netting. We were in the woods, so we didn't need shelter from the wind. The other thing you might want is the ability to handle snow loading.... which a tarp can handle. Also, because it is open, we would set up a campfire at the mouth to help stay warm.... a baker's tent would work even better for that situation.

So... what conditions do you want to handle with your 4-season tent?

p.s. Personally, I would rather have a name brand 3-season tent with me than a cheap no-name 4-season tent (Hillman)