I was in REI the other day and I noticed they have made a design change to the 1/4 Dome. They have replaced one of the diagonal hoops with two pieces of tubing.

The two new pieces each angle toward the peaks of the two sides. If you look carefully at the website picture at REI you'll see what I mean. It is difficult to describe in words only.

As a result of this change the sides of the tent are now vertical. It allows one to open either vestibule without water getting into the tent. Very nice feature.

I'd be buying this tent if it wasn't made of mosquito netting. I want a tent that is fully enclosed with ripstop for warmth.