I've had these maybe 6 months the wheels have sheared off the first bag within a week of getting them and the other bags wheels sheared off yesterday, I think half the problem is that when you stack them the bottom case's wheels are taking the pressure from the speaker above, If they where recessed a bit more and had larger feet on the bag the wheels would not take the pressure.
Anyone else had the same problem? Apart from this they are a good bag.