IMO, the inconvenience of having to open the thing up to change the battery outweighs the conveneince of the wireless-ness. The PS3 is a different story as it charges via usb so no batteries to change and no proprietary connections to worry about. usb cables are so cheap, anyway. I think I paid a couple of bucks for the 12 footer I have for this controller.
I have another cpo (same size) that I had printed at the same time as the SSFII: Turbo artwork. I don't want it (and the money I spent on it) to go to waste so I think I'm going to make another one of these. Same dimensions, for the 360.
Gatsu, my hat is off to you and I appreciate the comments. Let me know if I can answer any more questions.