When it came time to invest in a winter mountaineering tent, for me, there were only two choices in single wall tents, the Integral Designs MK1 and the Bibler I-Tent. I already had the ID Salathe bivy. In my opinion, the best bivy on the market. (Compare that to the Bibler Tripod bivy. It has poles..isn't that a tent? You can get a one man tent that weighs the same, gives you more room, for half the price.)
After all considerations, I opted for the I-Tent. What tipped the scale was the fact that the mosquito netting (remember, I was comparing winter mountaineering tents) on the ID is on the outside of the door. Ever see what spindrift does with mosquito netting? It gets trapped between the netting and nylon, warms up from you and keeps growing instead of sliding down. Open the door and what do you have? A big pile of snow on your sleeping bag!
The argument for putting it on the outside, explained to me by ID, was because you can easily open the door without exposing yourself to the skeeters. My argument was...it's a winter tent!
Both manufactures offer top quality products. You can't go wrong with either one. I've used mine in some pretty severe conditions and had no problems and feel quite secure in the workmanship of both.