Brother, this profile offers slightly more and therefore better cushion while encountering different road conditions. It is a profile that people choose (50 side wall) in contrast to 45 side wall. It works also. However, there will be difference in speedometer readings and decreased acceleration. Personally, I could live with speedometer difference but a decrease in acceleration, load on suspension and performance in braking (please note that your car's ABS behavior may also change) are all deal breakers for me.
But lets face it. If I can afford good dampeners with a good brand tuned suspension, 17" will be my choice. Till then, I love my car like everyone else and rattling is a nightmare for which I cannot always crank up the music to ignore.