I tend to play the sweep and slog sweep a fair bit as it's pretty easy to score runs from. I find it a lot harder hitting over the top straight down the ground as I'm not the most heavily built.
My advice would be to practice it a lot before you bring it out in a game, as if you're not confident in the shot then you'll end up not getting the distance or missing the ball etc. I play it to balls full of a good length against Med Pace or Spin, get a mate just to throw you a load of throwdowns and practice it.