This tool will help train your body about swing plane, pausing at the top of the take away and lag on the way down, which helps you to "strike down" on the ball, all of which a PGA instructor would eventually teach you about, but why pay to hear about something, when this thing help teach your body about? It really helps you to begin to feel the bowing of the shafts of your club(s), this sensitivity will only add to your game.
Because it is heavier than your driver it will also strengthen your swinging muscles and no doubt add distance to your drives along with helping with greater flexibility which will carry over to your whole game. Also great for warm up before practice or play.
If you're new, take a lesson and focus exclusively, and I mean exclusively on grip, posture and the initial part of the take away, once you've got this down, use this to get a feel for the rest and start hitting balls at the range. Then go to youtube to learn about hitting the various clubs regarding ball position, also to learn how to fade, draw etc and how to turn correctly, coiling, loading and releasing. If you still need help with your driver, you might consider the SKLZ "refiner pro" device.
There may be some things that training aids cannot teach you, but in my experience they can help save allot of time on lessons, frustration at the range, and get you making better shots on the course. I also like that I am not throwing allot of money at a guy to teach me something, at least this way I have a physical product that I own to show for the money invested. Like I said "YOUTUBE" baby!