" Fun toy to play with but not good enough to count on. "
With Speedlites (or Speedlights for the Nikon inclined) and the with the Paul C. Buff Einstein, the ControlTL system works consistently and at a professional level of reliability. Some folk like to think that you can't do pro level work with anythign other than Broncolor, Profoto, Elinchrom and while I get where they are coming from, they aren't right, at least not in every situation. If you are photographing Kate Moss, or a Maserati Catalog you probably do want a Profoto or Broncolor system. I shoot corporate , business to business advertising, annual reports, and editorial portraits (not fashion, and not high end life style) and the Einsteins and Speedlites work just fine for that. I also happily use Profoto and Broncolor pack and head systems where those tools are the appropriate choice.
"As well it's hard to change the strobe power without changing everything"
With manually controlled packs and monolights , that is absolutely true, and one place where Profoto's Air TTL system, when and if it is implemented on more than the B1 will be a stand out.
"Someone needs to make a special head for this that has a long flash duration."
It is not the the flash head so much as the system inside the pack that controls flash duration, if you are talking about things like AC powered pack and head systems, or battery powered systems like the the 7B or Acute 6ooB. And as I said before, at full power the Profoto Acute 2 2400 with a single head attached already has a god-awful long flash duration.
"Curious as to how profoto are going to use this on their own system on the b1 air as they have announced. If it works well I will buy 10 of them."
There is no hyper-sync, high speed sync, or FP syncing with the B1. I tried it and Profoto is explicit about this not beign a possibility. As a TTL controlled 500 watt-second monolight the B1 is terrific -as long as you don't shoot with a Canon EOS-1D X. I think the B1 is a terrific 500 watt-second monolight. Great (i.e. short) flash duration, and I love having the battery on board too,