Major Necro post, but I'm of the same opinion as Skii.. there isn't a point to a wireless joystick, it's not like a mouse where the removal of the cable gains an immediate benefit from not having the cable get in the way and even increase strain on the wrist.

Wireless will always be less responsive than cabled, until they nerf cabled to make wireless look better, or the next form of wireless communication is discovered, i.e. radio waves do not cut the mustard.