Whether you are a weekend wonder or a league bowler, having your own shoes is a must in my book.  Having a shoe with a consistent slide and that fits your foot will make you more consistent.  Plus, do you really want to wear shoes that thousands of others have also worn?
These shoes are well constructed and very lightweight.  Obviously, the color and style are individual preferences, but this is a good shoe for the money.  And, if you bowl more than once a month, you will actually save money over the long run by eliminating the cost of shoe rental.