You are right about the shite. They eat A LOT and shite A LOT. I feed mine Blue Buffalo, a high quality food, with almost no fillers. He really doesn't shite anymore than my lab did. Luckily, where I live I back up to a wetlands area, so I just let him run out there and handle it. If he is locked up in my yard (almost 2 acres) I just throw it out there too (with a shovel). That is one consideration, they need to get out and run. And be prepared for a big food bill. My eats 6 cups a day.
They are big dogs and can be hard to handle. If you don't have a dominant, commanding presence, don't get one. He will end up running over you and doing anything he wants. That is a very dangerous position to be in with a 120-150 pound dog. Don't be fooled either, the females are just as protective and dominant as the males.
This post was edited on 12/3 at 4:00 pm