Don't let the three pound weight fool you into thinking it's lightweight. It's the HEAVIEST 3lb detector I've ever swung. That 8.5x11 coil is like a pendulum and takes some effort to slow down at the end of each swing. (I will add that some people don't feel the weight/balance is an issue)
Don't get me wrong, I'm HUGE proponent of the ATP. It's a great detector at any price and unbeatable at the price they're sold for. I would HIGHLY recommend the 5x8 coil. It may not be a must have item but it's pretty damn close. Most of the users that get em keep on almost all the time because it works so well and really balances out the machine the way it should be.