Several times on this forum, I have posted that super-tight pockets have an advantage (shotmaking, tightening up your aim, requiring flawless stroke and mechanics, etc) - however, like Jude pointed out earlier, you won't be able to do too much with the pockets being super tight.
Case in point:
I had a friend that had his own table and decided to toghten up the pocket to like 3.75 inches - IMO - it was a dumb move. You couldn't make a shot down the rail AT ALL. On the break shots - balls would jar in the pockets and never drop. Bank shots usually were a waste of time. Most every shot would rattle in the jaws and after a while it just wasn't any fun. Most of the game was clearing off balls that were left stranded in front of the pockets.
He thought this would improve his game, but all it did was make the play less enjoyable. If you can't pocket balls at certain angles, you'll tend to avoid those shots. For a shot to go in, it needed a clear path to the center of the pocket. Any degree of angle would send the object balls into the jaws of the pockets - therefore - IMO - this was not helping his game at all.
I'm not against tighter pockets - in fact I prefer them. There is a such thing as "ridiculous". Anything less than 4.25 - you are robbing yourself of playing at your full potential. There is a different between "super tight pockets" and a pockets with a "tight cut angle". There is a big difference.
Now some of the things I have done during practice are this - When I had my own pool room, I played 14.1 on 5X10 snooker table with teenie weenie pockets - for about 30 minutes, then I would go to the 4.5 X 9 with the 4.5 inch pockets. When I was on the snooker table, I DID NOT shoot the reds - I shot at standard sized pool balls. Big difference. When I switched back over to the pool table, I was zoned in and the pockets seemed huge.
Sometimes (at the beginning of my practice sessions) I will put on the Practice Pro Pocket Reducers - I will leave them on for about 20-30 minutes - most of the shots won't go in unless they are straight down the center - After a while, I take them off and I don't miss much. Here is a photo of how much it shrunk the giant (standard) pockets on my Brunswick that I had when I was in El Paso -
This table, a 4X8 Brunswick Amherst, had giant pockets, and I got rid of it shortly after buying it. Vagabond came over one time and asked me why I had bought that table -LOL- I had just moved back to El Paso - I told him I just wanted something that I could use to hit some balls every now and then - he kind of shook his head in disbelief. We went elsewhere to play some one pocket that day, I don't think he wanted to play on it - I don't blame him at all - one night I played straight pool on the generous 5 inch pockets - when I got to 170 or 180, I stopped - mostly from embarrassment. lol
So bigger pockets can hurt you also - sometimes they will establish false confidence, and that confidnce will dissipate once you get on a table with smaller pockets. One thing I will recommend is that if you are playing on loose equipment, try to pocket the balls cleanly every time without hitting any of the rail or the pocket jaws. By doing that, you train yourself to avoid cheating the pocket unless you really have to. This is how I learned how to pocket those railbiters on a tough, tight pocketed Diamond table. If you want to play on a great table that will put your skills to the ultimate test, get on a Diamond Professional with a tight cut angle - that's all you need, really.