An important aspect, which in my opinion and has been mentioned so far not a word that this design roles (which design ???) no "roll away stop" is have (unladen).
What is very advantageous for ordnung- and cleanliness-loving people, the happy times back the chair and roll it, without driving around with it and to wear out the braking roles.
Had me also the "standard Topstar castors for hard floors" ordered that just have this feature (also says only none). What therefore and represents beside the anweichenden design and price the only difference.
Conclusion: Very good running, good quality (accelerated test), an acceptable price;
Recommendation.