Besides the power and sync buttons, the only real difference between the Kama and original are the C and Z trigger buttons, which have gotten a nice transparent makeover. The joystick, however, is nearly identical. Nyko also includes a wrist strap for the nunchuk, as now it can be tossed accidentally, just like its Wii remote counterpart.
Setting up the wireless nunchuk is easy. First, you'll need to make sure your Wii remote is on and connected to the console. Then, attach the tiny adapter to the base of the remote (where you'd normally clip on the nunchuk's wire) and turn it on. Turn on the wireless nunchuk and press the sync button on both pieces. A solid blue light on both ends means you're all set. (It's worth noting that you'll need to sync up once per gaming session--every time you cycle the Wii's power, you'll need to resync the Kama.) The receiver adapter piece does add on about an inch to the Wii remote, but it doesn't compromise comfort during gameplay. After a few moments, we forgot it was even there.
While we didn't have much of an issue getting our nunchuk synced, we did encounter a couple of instances where we had to resync our nunchuk because it seemed to be "stuck" moving in a certain direction. Just powering off and on the receiving adapter and nunchuk seemed to do the trick. Not to worry, however; this seemed to only happen when you first sync the nunchuk, and never affected us during gameplay.