Good, but take a tape measure.
The site manager, Karina, was wonderfully helpful and professional. However, my "5x10" locker (50 sq. ft.) measured only 5.5 x 8.0 (44 sq. ft), so take a tape measure when you check out your locker. They seem to have only 3 rolling carts, which seems too few when considering how busy moving days are in such a large facility. However, Karina let me use the office's 2-wheel dolly, another example of her fine service. Note: With a fully loaded rolling cart, the floor thresholds by the elevators can cause your load to rock or fall, so beware.