OSHA says you are not allowed to start a saw in the bucket...so to be fully compliant you'd have to come down (or lower on a rope) and have the ground man start the saw, then hand it back to you, every time you shut it off...yeah, those guys are buying battery saws like crazy!
I'm real tempted to get one of those just to keep on the SXS to keep trails clear or for a random vine that needs killin (I can't stand vines in my trees).