Buy It
I am on my second one. I beat the first one to death and when I heard about the double entry, I bought a new one. It keeps heat in, but what tent doesn't? Don't think that it will keep you warm, and keep in mind that if the wind blows, it will blow under the fly. I have slept in it down to -15 and it was fun, but not ideal. So...great summer tent, but if you want warmth, make sure you have a good bag.
Also, setting it up; I find that staking down the corners before you put the poles up creates a night flat and tight floor. I believe MSR suggests that in the set up instructions, not sure.
Another thing. Flies and bugs will get caught in between the mesh and the fly. No biggie, but you will wake to a symphony of buzzing during bug season.
No leaking and I use it without the fly all of the time. When I wake in a campground, I make sure that I am out of my bag and completely naked.
Buy it.