In a sentence. Xpadder is a slightly more advanced version of {the alternative} with a nice interface and a "click the key u want" binding
But if that doesnt convince you
What does xpadder have that {the alternative} doesn't?
-It has a full-time specailist ironing out bugs and making sure everything is dandy
-The interface it uses makes it easier to visualise what does what, and it is much quicker to bind
http://img12.imageshack.us/i/xpadderoptions.png/
-Profiles can be shared/discussed so that controls are the best they can be
-rumble, triggers and guide button support
bonus: you help jonathon (the developer) out
And also it is worth mentioning, When using {the alternative} it only seems to support one joystick, this of course supports two actually 16
Is it worth the money
If your serious about using a gamepad (and dont just want to mess around for a few hours then stop) then yes
If your a teen like me who treasures every fiver with his life. I think you will feel that it is money well spent, and if you add a sexy background (you can!) it is great fun to make profiles for all your app's