I've got one, and yes...it improves your speed and, accuracy, timing, everything...tremendously. I love it.
You want to spend some money on it though. Don't get yourself a cheap one. If you do, it can break, or it won't function properly, and you'll only be depriving yourself. Now I'm not telling you to go out and spend hundreds and hundreds of dollars, but get one thats a little above average. Don't go after the cheapest one you see.
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