At home I've used content caching for quite a few years. We have about 4 Macs, 5 iPads en 6 iPhones .... it's running on an old Mac mini which is doubling as a timemachine machine ...... I've set about 500g of cache.... and it's nice, not phenomenal .... especially iPhoto library caches nicely. IOS en system updates really go fast....
what might make a difference, where I live apple services aren't really fast (I've got a 1gbit fiber connection, and apple services top out at 60mbit. so all data from a local source are faster than the apple 60mbit speed....
if you've got specific questions, please ask....