Auto Top-Up Settings

Right now, I have my auto top-up setting to start topping up to max buy-in (of 100bb) when my stack hits 80bb. For those who use auto top-up settings... would you set your lower limit to 100bb so as to always keep it at a minimum of 100bb at all times? Just curious what you guys do... especially at higher limits.

I don't always use the feature because I like to keep track of where I am in comparison to where I started. However, when I do use it I set it to maximum buy-in.

I always keep my stack at 100BB+ unless I have deliberately bought it short to check out a table at a higher limit than where, I normally play.