I've been on a light gun gaming binge here lately and picked up this and it's PS2 sequel about a month ago. Definitely a pleasant surprise on both of them, playing exactly like Time Crisis set in the Old West. I liked them both much more than Endgame for the PS2 since they seemed much more inspired or original than it was.

For some reason I had always confused this with a completely unrelated PS1 Western game (Lucky Luke or something) and always assumed it was garbage until I saw it listed as a Guncon compatible game.