Asym urethane is a tough sell - big expensive cores, a shell that needs to be wiped every shot (to not grease out) and a very early cover that most bowlers will rarely need. The Hot Cell was on sale from my distributor a month after it hit the market and I only recall selling 1 widow urethane in our shop which went to a 2 hand lefty.
I've only thrown 5 games on my Phantom so I am not ready to write a full review, but from what I see it splits the difference between the True Motion + my midrange solids. A slower response cover with a low rg/low diff core should be a more welcome fit in most bowlers' bags. This is Brunswick's IQ/Web Tour.