Got my TopGun II today (actually a few of them). It is a little early for a review, but so far:
1. New Led stands: Four led spots instead of five. The one that earlier had three spots have two with one spot in the end removed.
2. Installation with the new drivers was very easy and worked right away. (Well, almost: Had some minor issues. The driver did not release the mouse cursor and the pointer was a little jaggy. These issues disappeared by reconnecting the gun and have not been an issue since.)
3. Calibration was a piece of cake. There is now five points to shoot instead of six. I did not even have to adjust the edges in the driver. Perfect !
4. Distance from screen: Using the original led stands on a 20" widescreen the distance required was about 40 inches. That was a little shorter than expected and worked the same with both horizontal and vertical mounted led stands. Note that on larger screen it is recommended to mount the led stands horizontally and larger screens will require more distance. It is also possible to modify the distance between the leds to optimize the distance required. To explain how I would need to make a drawing. I will try to do that sometime soon. It is really only to optimize the distance between the leds so they are in the field of view of the camera in relationship with the monitor size and corners.
5. The gun also works better now with regular gamepad drivers. There may be some uses for this. I do not know. Games like T2 used analog "gamepad" axis and with "AD stick sensitivity" set to 1% in Mame the cursor is very smooth. Anyone see the use for the TopGun as an analog gamepad, maybe in other games

Testing done on XP this time. I will try Vista later.
Really recommend this new version.

It may not be a giant step from the first version. More like a big step with Vista compability.
TheShanMan: You should go with these guns. It is a little early for a complete review, but it seems like many of the issues with the first version of this gun is gone. I will hopefully write a proper review and guide later if I find the time.