I can vouch for Lik-Sang's reliable console products (incl. light guns), but I've never gotten any PC controllers from them.. it's a product of HK (and well.. it's USB

), so be wary -- it's a crap shoot.
Also, avoid the serial/PS2 version.. the Act-Labs guns used a gameport connection which was sluggish at best.
Post a review if you get one, I want to know how accurate it is in MAME (if compatible). If only someone would hack a GunCon2 with a VGA pass-thru and write some PC drivers. -_-
k-spiff