You will get as varied answers as if you were asking about buck candy....
Some on here swear about it, some think it's gimmick.
A quick search will bring up some fun reads about it.
Bottom line is its your dollar not ours, and you can spend it however you want. If you fee it is worth the investment, go for it and don't look back. Worst thing to do is regret a purchase, or regret not making one...do with your money what you fee is right and it will all work out in the end.