These tents are really well suited to Alpine evironments when you may encounter snow and wind. But Epic is not waterproof and can completely wet out in extended period of rain. I had a long discussion with Black Diamond last year and they indicated that the fabric could wet out in high water pressure scenarios but could not give me a time frame - so it could happen in 5 hours, 9 hours, 15 hours, etc. Nevertheless, I would like a little more insurance with my gear.

Although this has never bugged me, the shelters do not come standard with a vestibule.