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It seems the majority of professional pool players prefer playing on tables With tighter than normal pockets - if you've been watching any of the matches from The Action Report (TAR) you will have noticed that the corner pockets are 4 1/8 inches wide, compared to the standard 4 4/8.
The fact of the matter is, a lot of pro's choose to practice on tables with tighter pockets because it sharpens your game. It doesn't sound like much, but you can definitely see the difference, and your game and confidence will improve when you have mastered practicing with ProPockets.