The evaporator heads the Nautilus had an often emerging criticism. Leak and low lifetime were a problem, what many (and me) the joy took the Nautilus. With the BVC Coils this problem a thing of the past to 99%. It can of course always possible that time is a bit flawed, but it has not yet happened to me with the BVC coils. To date, all have held longer than the original BDC coils and other confounding factors such as leakage, etc. there is no trace.
I use the Nautilus with the BVC coils only go because it was expired for the home from Atlantis and the subtank of rank (they are a little too large for use outside the four walls) and am still very happy. I currently do not see any alternatives and speak from a recommendation.