The withdrawal is definitely something to be aware of but I experienced very minimal symptoms when I quit cold turkey from 300mg. (or maybe it was 450?) I got the 'zaps' for a few days, not painful but strange. I just like to add that in, because it's not a horror story for everyone. People who quit without complications aren't going to talk about it.

About dry mouth: YES, this gave me constant dry mouth and REALLY dehydrated me. Drinking water is recommended though the amount you need is very inconvenient. Drink water first, but also chew gum to help with the dry mouth!!