The Move Battle Rifle uses the back for navigation, the front for trigger (it feels like you're firing grenades all the time). The Move Sharp Shooter is opposite, front for navigation, back for trigger, which IMO more natural and comfortable.
Man, the one I want is $20 more (
There are some discussions whether or not KZ3 MP mode will separate the Move and DS3 users. I think the rifle attachments will give you an edge when playing KZ3. With 3D glasses and rifle attachment, I think I'm ready for deployment :lol:
Correction: the Battle Rifle fires on the back as well, but that puts the Navigator in awkward position (how do you control it? Use the thumb?)