I think the new charge in behaviour will screw it up.
Pets do amazingly well fighting while in flight.
Just don't expect to use Group Fly as a Travel Power with pets since they'll drop out of it.
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Actualy you can use it as a travel power if you follow one of your pets and use goto.
But with the new behaviour one of your pets will always swoop down and fall out of fly (and buff auras) and then get ganked.
I use group fly on many of my masterminds. The chief reason I take it is to overcome the bad pathing that pets utilize to follow me between levels in maps. I really don't like to fight going up the switch back ramps and such.
Group fly also works great when fighting knives of artemis with the caltrops that ALSO have a fear component.
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HelinCarnate:OMG it is so terrible. I have the option to take 3 more powers but no additional slots. Boo F'ing hoo.
I have never used group fly in all my 4 years of playing with mm's, with the coming changes to group fly mainly the -acc removed, is there a practical reason to use it when the 20.5 arrives, or were there other problems with pets flying besides the -acc?