The Venturas have simple but effective R and K mounts, with a screw that adjusts the tightness according to the diameter of the rack.
There's no adjustability in positioning, so check they fit with your rack, though the stabilising arm offers plenty of lateral movement and a Velcro tab acts as a safeguard to keep them on. The Agus have a nice, user-friendly shape. They open up wide and are easy to get into. The material is thin and lightweight but hardwearing and abrasion resistant, with good stitching. There's a roomy outside front zippered pocket and side Velcro pocket, plus big reflective strips on either side. But they're not waterproof and there's no cape.