There is a little bit of flex if you put the tyre between your legs and tug on the bars but when im riding, i dont notice it at all. They are super plush and can take some serious abuse. However theyre damn rare and cost £1100 plus £150 worth of TF tuning, so probably not worth the money. A bit of bling though...
Iv recently recovered from popping my collar bone out (didnt even know you could do that!), dislocating my shoulder, breaking my wrist and mashing up a finger, which now gives no grip on the bars. You got off lucky id say. Get well soon mate...