Well made and magnets hold well, even on an open Bonneville. The 12-liter is a little small, an iPad won't quite fit due to bag's teardrop shape.
Sometimes wish I'd gone for the 18-liter bag, but this one helps me keep to a minimalist credo and keeps center of gravity low.
Also it's out of the way of your torso with cafe bars, which a bigger/taller bag wouldn't be. The phone pouch is a little tight for iPhone in an Otterbox-type protector. It fits, but tough to pull out with gloves on. Internal pockets are handy for small things; pen, tire gauge loops are nice.