The sidewalls are fairly soft on the Assy 2's but I've never had a problem with them. Like already stated, I've used them on track on various occasions and they've always filled me with confidence.
This is how much they deform when pushed really hard, these were the 92's and they're rolled over so much that the rim protector is almost on the Tarmac!
Had scrubbed off almost all of the writing on the sidewalls by the end of the day.