These are decent wheels.  I purchased cheap wheels before this, and struggled to move even a lightweight wood cart around.  On my latest project (300 pound workbench) and used these, and WHAT A PLEASURE.  Nice to be able to move the whole thing with one hand.  The wheels are not cheap, but it seems you get what you pay for.  With both the wheel and swivel locking, it makes whatever they are attached to rock solid.  The lock is a bit of work to disengage (if you are wearing soft shoes), but doable.  So far over two months, no flat spots.  We will see what the summer heats does.