I don't know how everyone else feels about sharing, but the thing that has put me off is the commitment to pay out money.
Although the hourly costs may work out cheaper, I like hiring from a club because if I don't have any money and can't afford to fly, it costs me nothing. If you're commited to paying a fixed amount each month then if you do have financial problems it's just another thing you have to find money for.
Also, there's no chance of having to find a big payment for maintenance or an upgrade.
True, the planes from my club aren't the best equipped in the world, but they are maintained well as they are hired out so have to be.
The main advantage of sharing for me would be to take the plane away - my club wants minimum hours a day flown, which isn't always practical.