it has the abilty to save the plane that quick if the gain is right up correct? if its like HAL that is, on low gain it simply has less throw on the surfaces and so cant fight you as hard. that then means at low gain recovery is slow.
on the other down side, with sudden recovery at that quick, high speed stalls, snap spin are all possible which the co-pilot should sort, but not quickly.
at low speed if you stall, it wont apply power, it'll just pull up, it wont let the plane dive to gain speed.
i guess if you install it so it keeps the plane at a certain nose down angle that its diving enough not to drop speed to below stall.
i admit i've never actully used my HAL unit as i brought it SH to try the prophang thing Don Incoll had his set up for. i did think about using on a plane so i could fly it low without hitting the deck. I've heard all sorts of things about putting it in helis, the wind drifts it off to a van, it stops and backs up!, also about trainers dissapearing off into the distance jumping hedges and any thing in the way