The harness works as intended, keeping the camera secure while bicycling over rough terrain and providing easy access. The rain cover deploys fairly quickly.
I use it with a DSLR with a manual zoom lens. The strap that secures the lens could use a secondary strap to prevent the zoom from "drooping" (extending itself to the telephoto end) while riding. It is possible to add something yourself, but the manufacturer could do a better job of it at minimal cost.