I have the no!no! but I could never get myself to commit to it! There are a lot of specialized makeup brushes I rarely reach for – I tend to just use a core set of brushes. I don’t regret it, but I wouldn’t recommend “collect ’em all” mentality with MAC brushes — better to buy multiples of ones you use all the time!
I haven’t checked a bag in five years or longer (I also have not gone on any trip in excess of a week), so I pack everything in my carry on, which ensures less handling (and better handling when there is) and that nobody is going to steal anything. I cushion makeup bags or palettes between sweaters and pants–anything thick and soft–or else keep it in my shoulder bag.
No, I don’t think I have any brand loyalty. Initially, sure, I was using about 99% MAC products, but the brand is such a perfect gateway drug–the price point is less than other high end brands but you get the same “experience” of the store/counter, range of products, etc. Plus, with something new rolling out every few weeks, you never have time to go anywhere else! Since I started blogging, though, that has all gone out the window, and it’s given me a better appreciation of what goes into good/bad products and what works and doesn’t work.