I have a Katabatic Bivy and love it. The net is large, the design is great, the quality is excellent. Aaron responded to a minor complaint and improved the zip stop design.
A brief review is here:
And the updated zip stop here:
There is plenty of room for a NeoAir or POE pad inside, and the corner stake out points are very useful.
Incidentally, I had a problem with the TiGoat bivy - the tie out point is attached directly to the mesh, and is more prone to ripping than the Bristlecone, where the tie is attached to stronger material near the zipper.