Headhunter is absolutely correct. Short-barrelled revolvers have poor aimability, greater muzzle flash, muzzle jump and felt recoil. The only benefit you gain is concealability. Definitely rent one, if you can, and if you choose to purchase one, practice is the key. You definitely need to spend more on ammo and range time to be proficient with this. Other than that, it can be a good defensive piece!
“Malo periculosam, libertatem quam quietam servitutem." (I prefer the tumult of liberty to the quiet of servitude.). Thomas Jefferson
"All that is necessary for the triumph of evil is that good men do nothing."
-Edmund Burke, Loosely translated from Thoughts on the Cause of Present Discontents. (1770)