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I have these ones. I have cleaned them out once while having them and it worked great and restored them to like new performance.
I've had a set for over a year and a half and they are fine. Had a set before that for over three years and the reason I replaced was that they didn't come apart for cleaning (had a very fluffy cat and the ones that didn't come apart got quite clogged). My wife has used a set of the same product for the same amount of time as well and none of the wheels on either of our chairs have broken. We are about 120lbs and 220lbs.
There are always going to be bad reviews where people got a faulty product or where people pushed a product past its limits (I don't blame them if the manufacturer overstates how much weight the product can hold).