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Besides the annoying vertical alignment of the plus widget to the text, if you look closely, you'll see that the highlighted click box only extends as far as the text goes.
The Locations part of the calendar was one of my most-used items in GNOME 2.x, but using it in MATE is a frustrating experience.
The lack of consistency in the interface's theming is a small fault, but a fault nevertheless.
For sheer interest's sake, btrfs was chosen for our review. It behaved fine, and we experienced no problems.
As the picture shows, there are many options other than btrfs available.