Also, I'd figure out what you're priority is.
If you really need a durable winter tent for camping in places with heavy winds and high snow fall then get something like this.
If you envision yourself camping more outside of winter and occasionally snow camping a much cheaper "3-season" tent will work fine and be more comfortable in rainy and hotter conditions.
You certainly don't need a winter tent for camping below tree line in good conditions.

To add to what's been said...this tent would work in the summer, but there will be compromises. Some of these include: weight (although this tent isn't crazy heavy, there are 3 season tents that are half it's weight), ease of set up (it is a bomber tent, but can be a challenge to set up because it is made to withstand snow loads), doors are on the small side to keep spindrift (blowing snow) out, and ventilation in humid conditions might mean condensation. If you are wanting one tent for winter camping and summer camping, this tent is as good as you will find. For winter camping there isn't a better 2-man tent on the market, and winter is really where a quality tent becomes super important. I've used it in every season and have always come away impressed and proud to own one. One of the features I really like is the hooped vestibule which gives you a large space to store your pack, boots, wet gear, etc. without dragging them into the tent. As long as you understand some of the trade-offs, I don't think you'll be disappointed.

Susanne,

It all depends on where you're looking to use it, the humidity outside, temperature, ventilation, etc. As long as it gets relatively cool at night where you'll be sleeping, I think you'd be alright. If you wanted to camp in the summer in Georgia or Hawaii or similar places, I think you'll have a problem with condensation on the inside. Other than that, its a pretty bomber tent!

Hope this helps!