Has anyone had experience with this pannier?

I've been thinking of building or buying a "hard shell" pannier, with locking capabilities, for around town shopping and errands, and this pannier seems to fit the bill. But before buying yet another set of panniers, I'd like to get feedback from anyone who's used 'em.

Exterior Dimensions: 15 x 15 x 9.5 inches. Interior Dimensions: 13.5 x 13.5 x 9 inches. Empty weight: 2000g