The old gameport guns are horrible.. you can try to use mouse emulation for MAME, but it sucks due to the wacky resolutions (and the way it works).. in fact, the only game that ever worked worth a damn was Die Hard 2 for PC (even the in-box demos don't work right).. and it sucks because the gameport apparently doesn't handle such a high-bandwidth device very well (ie: things get jerky when you pull the trigger too rapidly).
I've already thrown away one gun from my set of two and am only keeping the 2nd and the base to see if the innards can be retrofitted into a GunCon or something cool looking and made to work right (with a non-shi^.^ty trigger -- another major design flaw passed on to the new models). If so then I may buy the TV version after I read some reviews..
Also worth mentioning is the lack of XP drivers and the fact that Act-Labs doesn't support these any more.
But if you still want a set, e-mail me.. I've got a Power Glove you may be interested in

..
