This is one of the best rain flys I have used. It is loaded with features that are not only convenient but really keep you dry. Attention to detail is apparent throughout the design, from the clip-in point to the doors and windows. If you get in a storm you will be happy you are in one of these. This is intended to work with the Black Diamond Cliff Cabana Double Portaledge.
It is bomber, ventilates well, and has a ton of features to make your storm experience as comfortable as possible. That said, it is expensive, heavy, and takes time to set up. If you are climbing a summer wall or don't anticipate a storm, this is overkill. If you anticipate some winter or late fall ascents, definitely get the Deluxe.