I don't agree with all of the items listed, but I think JSONKit is a really nice piece of work. What would you use instead? I know there is native support for JSON handling in iOS 5, but 1) I don't know how that stacks up against JSONKit performancewise (if anyone has benchmarks, that would be excellent) - but JSONKit really flies, especially when directly handling raw bytes instead of an NSString and 2) It will take quite some time before iOS 5 is the de-facto standard. FWIW I used to use SBJSON and switched over to JSONKit and have not looked back.