Aye. While in university, I spent lots of time in the antenna lab (which doubled as an anechoic chamber.).

Even hours and hours of exposure couldn't help me get my bearings; I became dizzy within seconds and, on some occasions, even felt like I was about to barf.

Luckily I didn't fall over - 'our' chamber didn't have a wire floor like the Microsoft one - just a narrow walkway into the center of the room where there was a pod for installing whatever gear you were about to test.

Falling onto those tiles would probably cost someone a fortune. (I've got no idea what anechoic tiles cost, but I know they are rather brittle. Don't ask me how I know.)