Make sure the Acute600R meets your need for freezing action, the Pro7b and ProB2 have a shorter flash duration. Other than that and the obvious smaller battery and 1 stop lower power, i love the little thing.
You can get a converter kit to use your Acute heads on the 600R, just became available a little while back. (Have not tried it.)
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Love Mine...BUT and a big BUT I think it is more for Indoors lighting on Location.. Not great for overpowering daylight at all, and get atleast 3-4 batteries for sure.
Also I do not think it is Built well for Outdoors which for me is dusty, dirty and sometimes Beach sandy locations, It will not last very long.
Also the flash duration is actually pretty darn good, Much better than the acute line fore sure.
My modeling light never has worked since day one but I live to far away to send it back.
It is good but I thnk they could have designed it a little more rugged and more rubber on the bottom to tell you the truth.
I sold of a lot of my Hensel stuff thinking the 600R would be a little better.
Does work fine but if you get a chance check it out first.
If you do a lot of outdoors I would think about another unit and that is coming from someone that has all profoto stuff and Loves Profoto.
The price and size is great for sure.
Just an Honest personal view. I shoot a lot of Catalogue and Fashion stuff outdoors and shoot 20-30 Pictures (Each with about 25-50 frames per Picture) a day often for several days you'll wish you had gone with the 7B2 or Hensel Porty Plus system...
Snook
Should add that it does re-cycle pretty darn quick also..:+}
You can use Acute heads and D4 head's , it is just the modeling light won't work with out the new EXT. cable