take off all HUDs - that helps - don't know why .-)
Manufacturer's link ... http://www.3dconnexion.com/index.php
SpaceNavigator: "... is a six-axis controller that you use in conjunction with the mouse and keyboard. With it you can move around the model in three dimensions, intuitively and without changing from one mode to another (e.g. pan to rotate to zoom). You can also configure it to work in what ever fashion is easiest and most intuitive for you. With a little practice you can move through and around the model using the mouse and SpaceNavigator, never touching the keyboard."
On my pressie list too :)
For now, I use the kids Xbox 360 controller. Not sure how it compares, but the analogue controls can give some really smooth dolly shots.
The flickering is a known bug and has been reported by many. Two ways to stop it - switch off any huds OR switch all lights off except for sun and moon.