This takes is pretty much exactly what the covers suggests, which is to say pretty much a rewrite of "The Magnificent Seven" starring the Justice League. While there aren't any major plot twists or great revelations, it's nevertheless a very enjoyable read, due in large part to how neatly the various characters are transposed into the old west setting. The decision to make Wonder Woman the focal character is a good one, and each of the league members is given their moment to shine. The absence of Superman and Batman benefits the story, because either of them would inevitably have become the focal point, to the overall detriment of the tale. The art matches perfectly, continuing the feel and abounding with nice touches. 
 I found this one a lot of fun to read, enough so that I suspect the concept could have supported a miniseries or even a maxi-series. Worth a look for superhero fans.