old bit-tech review is a bit scathing of it. Was £33 when it first came out
http://www.bit-tech.net/hardware/peripherals/2008/02/27/zalman_zm-fg1000_fpsgun_gaming_mouse/1
http://www.bit-tech.net/hardware/peripherals/2008/02/27/zalman_zm-fg1000_fpsgun_gaming_mouse/1