I have a hard time understanding why anyone would want a table with 4.5" pockets.
Tighter pockets will not make you a better pool player. If I play golf with professional grade equipment (tour blades for those in the know) it will not make me better at golf but it will sure as heck make the game tougher and less enjoyable.
I guess if a person plays top level pool and wants the added challenge of a smaller target I can understand it,,,, , but seriously, how many people play at that speed?
For the general masses, I say to heck with a more challenging table,, this game is tough enough with 5 inch pockets,, why make it more difficult?
Taking away the rare exception of purpose-built one pocket tables and gaffe tables used for gambling, 4.5" pockets are what you'll find on tables in public places. Feeling like a hero at home with 5" pockets isn't going to do you any favors when it comes to competing on good equipment.
If you're buying a table to actually play at home and get better, a 4.5" pocket that accepts well hit shots and rejects what it should is worth the price of having it done properly by a professional.