I definitely agree that the side pockets need to be decent sized. When they are too narrow they won't accept balls from a shallower angle. A couple of the places I play have tight side pockets and it does not improve the game at all. For my personal preference, 4 1/2 to 4 3/4 for the corners and 5" for the sides. I'm not a big fan of the deep shelf, balls hang up deep in the opening and the cue ball will catch a point, making position hard. At that point, I'd prefer if the pockets spit the balls out.