Interesting experiences from members both ways, problems with wet sleeping bags in the Nallo and those without. Getting feedback from other users is really good in making buying decisions, but sometimes one's own experiences are the best measure.
Personally, I consider an 87" length a bit short for my 6' length and I have had problems with wet foot before in other tents, but not the one time I used my Nallo in wet & calm conditions (snow & rain). Was it because I had the rear floor vent rolled up? There was certainly plenty of condensation on the underside of the outer tent. Was it because my sleeping quilt did not slide down to the rear of the tent? Was it because it was not cold enough at 33-34 degrees? Was it because I had a taut pitch as recommended? Could the results differ with back sleepers with big feet versus side sleepers? I might add that not only was my 5'5 wife sleeping in a size L bag, but our 55 lb dog spent a good bit of the night curled up in the bottom of her bag, and it was dry the next morning.
I do know that when I checked with REI, North Face and Mountain Hdwe some years ago there was no standard way to measure length. North Face, for example had no idea how this measurement was derived. Most reputable retailers will allow you to return an item that is not what it is claimed to be. I now measure the floor when I buy a tent to make sure it is accurate. I measure the flat surface only, and do not include the sides that make up the "bathtub" floor".