The rack feels well-built, and nicely designed to be adjustable, but the holes to attach at the rear dropout next to the wheel nut are in the wrong place (for my Quella Nero). There was too much metal below the hole, meaning it overlapped with the nut which holds the axle in place and so I couldn't tighten that bolt.
I swapped the rack for one on another bike, and the Quella rack fitted the other bike, but it is a shame that it won't fit on a Quella bike!