Besides, it's utter nonsense that the Topguns track fast if you press the trigger and just lag when you don't. Like always, you are just making stuff up again.
I think you need to cut X a little slack (did I just write that?) I don't know whether he's correct, but he certainly could be. The reason you get lag is usually due to averaging routines used to reduce jitter, which in order to work, require oversampling of the mouse position, which means updating the cursor 1/Samples the time, instead of every time the read position is reported. It may be beneficial to smooth out the jitter more when the user isn't pulling the trigger, and then focus on where the gun is actually pointing when the trigger is pulled. Otherwise, fast movements might lag and cause the wrong icon to be clicked, etc.
As for LEDs arrangements, this is only of real importance to extrapolate the position when the gun is turned from perfectly vertical. Since the LED's on this product are arranged in a straight, albeit small, line and the bar is expected to be in a fairly specific position in relation to the screen, one can still calculate angle offset. While it may not be as easy to do as it is when the LED's form endpoints of a larger line (Wii) or a specific known pattern (TopGun), ease of computation is not an indicator of accuracy. Accuracy is purely a function of the viability of the hardware and software combination in coming up with the correct answer, and that is unknown to anyone but Andy currently.
Personally, I have no idea how well this will work, or whether a mostly fixed shooting position will be a problem (for most, I suspect it won't be, but again, best to wait for some reviews). But one thing I do know is that the community has been in need of a good solution to this problem for a long time, and as one who also really enjoys a good shooting game, I too am cautiously hopeful that this will fit the bill.
RandyT