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A pain to pitch properly, not nearly as well designed as the tent
But when you want or need a vestibule on your Bibler or Firstlight its your only chance. The earlier review sums up the limitations well. Caveat Emptor.
Vestibule adds room but also weight and hassle
I got this for two person trips with my dog for the extra room. It is pretty light but still 1/3 the weight of the whole tent, pretty expensive, and pretty complicated. It made my tent setup time about double what it was alone. I also found that the vestibule pole tends to come undone from the grommets on the tent. I'm not sure if it will really keep all the water out of the tent either because of the gaps between vestibule and tent wall on top. That said, it did what I wanted it too, wasn't really heavy, and made my night much more enjoyable. However I wouldn't bring it on a trip unless it was a two person/dog trip and I expected significant rainfall because it's too much hassle.