I agree with DB6. I think its a good technique to use when the aircraft is on the desired approach path but I don't think its good for correcting approach path deviations. These are better made with the more traditional method (in my opinion).
By the fact that you point at the aiming point all the time with this techinique, you'll simply drag the aircraft in if already low and glide it in (if possible) if already high - you need to move the aiming point initially to regain the desired approach path. However, its always possible that I'm missing something.
Regrads, GT.