That will make sure you get a complete fill but if the market is moving fast it could be risky. AON orders go to the bottom of the line up. Unfiltered orders go through first, and faster. I don't use it because I have never had it become an issue. I would probably consider it if I got partial fills all the time. If you have a broker that gives you a lot of partials it might be worth adding a new broker.
"Sort of" is such a harmless thing to say. "Sort of". It's just a filler. "Sort of" - It doesn't really mean anything. But after certain things, "sort of" means everything. Like after "I love you" or "You're going to live" or "It's a boy".