I'm not really a big shotgun guy, but for home defense there is no substitute. In the extremely unlikely event of a home invasion (worst case scenario) my pistols are there to give me time to get to my shotgun. You have to assume in the case of a home invasion that the intruders will also have pistols, so your pistol gives them a surprise, but it's an even fight at best. The shotgun changes the balance.
I've had the Mossberg 930SPX about two years now, and I've put about 500 rounds through it and never had a single failure. Along the way I bought a box of clays ($5) and discovered clay shooting. It grows on you, it's great practice and will boost your skills and confidence. And once you discover semi you'll never go back to pump.
"Socialized Medicine is the Keystone to the Arch of the Socialist State.” -Vladimir Lenin
"I predict future happiness for Americans if they can prevent the government from wasting the labors of the people under the pretense of taking care of them." - Thomas Jefferson (An early warning to Obama care)