After looking into both of them I'll be getting the power shoot. The video's on the "grass flap" website didn't impress me at all. Anything that has bungie cords hanging off it in the demo is not something i'd buy. Additionally, it seems like it just flips open when the mower has too much grass under it. While the idea makes sense, I don't like it in practice. For example, if you're running the right side of the mower past a flower bed or landscaped area and the shoot automatically flips open due to a large amount of grass under the deck 1), that defeats the purpose of controlling the clippings and 2), you just discharged an even larger amount of grass into an area where they weren't wanted.
Just my .02
Residential & Commercial Mowing