It's been awhile since I've played, but I remember it being a loads of fun and fairly simple to learn.
I prefer it over Legends of the Old West because the activation order is random (each figure has a couple chips or slips of paper with its name on it placed in a hat. You draw from the hat to determine whose activation it is. Some characters get bonuses allowing more repeats of their name in the hat.)
And even if your turn doesn't come up anytime soon, if someone shoots at you, you can get a retaliation shot off.
Pulling slips from a hat also allows you to add random events that can be drawn along with the names.
During your activation, there are multiple actions/"tasks" you can choose from. Some actions take multiple activations to complete (such as aiming a rifle or saddling a horse.) Of an action choice doesn't exist in the rules, it is very easy to houserule. (I houseruled loading and firing a gatling gun in one game, for example.)
Each character has a base Target Number which they have to beat on a dice roll when shooting/fighting. That number can modified.
Ammunition is kept track of (all of your character's stats can be kept on one page- along with ammunition tallies.)
Sneakgun is right: One character per player is good; I think the game is best played with lots of players. I once ran a game with 10 players, and it only took a couple hours.
I haven't played in a few years, so hopefully someone here can give you some more reliable information.
looks at some new terrain products, which use space age technology!