Lemme tell you what's gonna happen here...
First, the CZ owners are going to tell you that the Shadow was designed for IPSC, and because of it's
low bore axis 
it's the only thing you should consider for the sport.
Then the Glock owners are going to chime in and tell you that because Glocks are cheaper than a Thai hooker, and you can drag them behind a truck, underwater, and through lava, and still fire them, you should buy a Glock. (Yes, this is despite the fact that you may never have been dragged behind a truck, can't swim, and avoid lava as if it were, well, lava.)
Next the M&P owners will insist that their M&Ps are as good or better than Glocks. (Are they right? Who cares??)
About this time, SIGophiles are going to tell you that you're going to end up with a SIG down the road anyways, so you might as well save up and buy one first, then you won't have to mess about with inferior weapons.
Then someone with a Beretta is going to tell you that, based on the US Military's use of them, you should TOTALLY buy a Beretta, because it's a proven design, and nothing is prettier.
Is any of this useful information? No. Somewhere in the middle there, someone is going to tell you to go and handle all of the above and more, and pick the one that feels best in your hand. Guess who you should listen to?
(Did I miss anyone?)