Would you have your flat screen TV installed on your wall?

would you reather have the flat screen installed on your wall or would you reather not? for those who have flat screen tv hanging on their wall, do you sometime wish that you hadnt installed on your wall and have it sit on the entertainment center on your living room floor? my wife is telling me that she think it is better to have in sit on the living room floor then hanging it on the walls. any of you had a second though after you had it installed? thank you for your time.