Many golfers slice the ball whether they want to or not, so an offset club might be the answer to their prayers. The most frequent problem for slicers is leaving the club face open at the moment of impact. But with offset clubs, a golfer has more time to bring the club head to a square position before striking the ball because of the lag that will exist between the shaft and the club head. With the club face now square, the golfer will tend to hit the ball straighter.
When the face of a club is not directly below the shaft but behind it, it causes the club to change its center of gravity. And that will change even more if the club head is set farther back. Because the shaft of the club will pass the ball before the club head, the angle of the club head will widen a bit, causing the ball to fly higher in the air. For golfers who are plagued with balls that fly too low, offset clubs might be the answer.
Many golfer have a problem with their slice and the height of their golf ball when they hit their woods, hybrids and long irons. They become less of a problem as they hit shorter shots. If this describes your game, you might buy offset woods and hybrids to see if they will cure your problems. You can always "fill out" your set later if your game would benefit more by using them. You can rely on offset clubs to help with your problems or you could take a lesson to correct flaws in your swing that lead to slicing or hitting the ball low in the first place.