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They wobble back and forth, a lot, once you get above about 2mph. You can't run with them, or even walk normal speed, without them rattling like a shopping cart. I'd be less critical if (1) they weren't super expensive, and/or (2) if the problem weren't so easy for the company to fix.
You pay a super-premium price for these, so you have to expect them to work. The rattling back and forth could be fixed, so easily, if they just added a lock-in-place switch that you could turn on when you wanted it.
It does what it's told. Kinda pricey for casters, but I couldn't make them for that price. They drag through deep sand instead of rolling on the top, not too surprised there, just rock it back and roll on the main wheels.