Why don't use jSEND?

If you fully approve to one of the 5 questions below, you shouldn't use it:

• Are you NEITHER a web developer, NOR a web designer, NOR a web enthusiast? ...sniff :o(
• Do you want to achieve »AJAX uploads«^*?
• Do you only send small amounts of data (< 500 bytes) to the server, always?
• Is bandwidth usage no subject and does all of your users have broadband internet access, all the time?
• Do your clients use outdated hardware^** or extremely low performing devices to access your (web) application?

Even though you think you don't need it, please evaluate the technical approach of jSEND.