I haven't had the pleasure of watching Genna's display yet, but I have flown with him in our Yak and learnd a heck of a lot.
The Skytrace video has some excellent footage of Genna aerobatting the Yak - including the flick roll on take off seen from inside and out - and that amazing landing technique - fast low run downwind along the runway, pull up to a steep climb rolling inverted near the top, gear down (up??) and flaps during the inverted, and pull through a half-loop to land.
Superb!
SSD