There are many approaches and methods for the golf swing and many different golf swing training aid, but the one thing they all have in common is that they all need practice, and if you ever played golf in your life, you know that this practice may take a little longer than the 3 hours you spend on the golf course every Saturday morning.
Golf is a game that requires perfection in many different levels, even for those who want to reach a lower handicap, something around the 11-14 golf handicap means that you need to spend a lot of time practicing your swing, not to mention your bunker play, your mental game and the many different situations a golf ball on a golf course can create.
Most golfers, or to be even more precise most amateur golfers (not professionals) do not have enough time to work on their swing, I never met a golfer (and I met a few) that told me they had enough time to work on their swing, and that creates a huge problem, trying to get to the course (did you ever try to swing a golf club indoors? Dont.) and manage some social life will not allow the average person enough time to work on his swing, and this is the exact reason why so many golf experts have devised many golf training aids to help golfers out.
Golf training aids are meant to be used mostly in the home, in the office or at the park while spending time with the kids, most of them are not meant to be used on the golf course because once you are on the course you should focus on playing golf and not practicing it. Golf training aids can help you with your golf swing, it is not a guaranteed fact that you will get better, but having some kind of golf training aid will increase your chances to work on your swing just because it will be more available to you.
Constantly working on your swing, at home or at the office, for a few minutes a day can do wonders to your game. If you are taking golf lessons or you plan to go to a golf school to get better, than you absolutely should consider getting some golf training aid it will make it easier for you to repeat what your golf instructor told you, it will give you the chance to keep working on that new thing you just understood on the range every day, and wherever you want, its a great advantage.
The golf swing training aid is the thing that you should invest in before putting money into lessons and golf schools, just because it will allow you to do what they teach you every day, or at least twice as much as you can today (when visiting your golf club or a golf course near your home). There is no doubt that the most significant thing in golf is the swing, and someone told me that golfers think about golf every 3 minutes on average (I know I do) I am pretty sure that most than half of these thoughts are golf swing thoughts put more time into it, and get better, by using a golf swing training aid.