I have the Phottix Cleon II for my D300, and it works great. I just ordered one today for my D7000. It is the Phottix Cleon II, version N10 which includes the D7000 if anyone is interested.
What I like about this system is you can fire it from anywhere. You don't have to be in front of the camera.
A little pricey, though. I thought it said $46.31, but found out that was Euro, my cost plus shipping is $65. But it will be worth it. The range is much further than the Nikon ML-L3. Go to the Phottix website.
The "rear sensor" is the same as the front sensor when you elect to use a remote. The ML-ML3 works great and since you have a sensor on each side of the camera it makes for much easier set ups when you can pre-focus. The manual is similar to others and front to back is 326 pages that covers the camera. Welcome aboard and good luck with your new toy.
Nobody should seek his own good, but the good of others. <><
I don't know what I'm doing wrong, or if I accidentally changed something, but now, with my Phottix plugged in, when I turn my camera on it fires on its own without me firing the remote myself. Plus I don't see anything through the viewfinder when I do try to use the remote to focus/fire. I turn the camera off, and back on, and it fires by itself again. When I unplug the remote, the camera works fine with my finger on the shutter. What have I inadvertently done?