No problem with rain.
This tent was used in heavy Colorado rain and the 2 wall design worked flawlessly. People in other brand tents were complaining while I was bone dry. The vestibule caused absolutely no problem with rain coming 'into' the tent. This simply was not an issue. Actually, it may be one of the better tents out there for heavy rain conditions because of the stout fly design. Since the fly can be easily made tight there is no chance of the fly and the inner wall ever hitting. The 'backpack' type snaps and closures make this a fool proof design for any rain situation.