After about 1 year of rolling it to gigs through bumpy parking lots, sidewalks, etc, the casters had seen enough. Especially sometimes with a Crest CA9 on top. Just too much for them. Entirely my fault, of course, but no big deal. The metal shafts of the caster mounts had bent. In the 3rd picture, you'll see the two shafts on the left are bent. I just swapped them today with the Mesa Boogie casters I ordered. They are great! Easily swapable too!