Usually a bad idea to poach and hit a volley into someone's chest. First of all, it's the easiest spot to defend, since your racket is right there ready with a backhand volley. Second, it can **** off the defender, who now decides to wake up, move back when his partner throws up weak stuff, and then HE poaches. Third, it's easier to hit a clean winner at his feet, but just out of his reach either up the middle or DTL.
This scenario is prevelent in maybe 3-3.5 level tennis, where the poacher has no control, but you seldom see it in 4.0+ levels.