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.
Experience is a very bad teacher because it first gives you the test and then teaches you the lesson.