We're working out what we think - we'll add our view here!
Big Sky International says:
The Wisp 1P MV tent is well suited as a bivy replacement. Think of it as a "super bivy" since the Wisp is totally enclosed to escape bugs and mosquitoes, it is also big enough to be able to sit up in and change clothes when it is raining, which is impossible to do with a bivy. Another bonus is the Wisp has a covered vestibule that a bivy does not have to store pack and footwear out of the weather. Double walled head end for condensation management with option to roll back head end for Moon View or extra ventilation.