Quick comment on this CE we’re about to get:
If you don’t have a ton of MPs, carefully consider before buying it whether or not any of your friends would use it if you put it up.
I can afford it, but I won’t buy it. Master XP is a distant priority behind every other type of XP, and this CE works like CTT and BL, so its full value is in being borrowed.
Buy it if you want, of course, but don’t do it just because it’s new, and definitely don’t waste days of gameplay farming MPs for it if you’re short.