All of these comments are consistent with reality of course. The floor has to be very smooth, the dollies have to be very straight and the wheels cant be sub-par.
All this being said, you can always do what I do. For example, I look these dollies over carefully, decide the metal and welding is adequate but the wheels are not. I purchase them knowing I need to get better wheels that add to the cost. Its still a viable solution to the problem since it seems that there really isn't a better manufacturer out there. We as the end user are being exploited. We know it, so we have to take it from there.
