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NegromancerI've skied Chronics and I'd say they're a medium flex. Not so soft that they jitter and can't carve very well but not so stiff that you can't flex them nicely and get up on your tip and tale. Honestly though I think the most important factor is how well your boots fit and the flex of your boot (stiffer is better (with in reason)). I ski AR7's which are pretty stiff and before I couldn't butter at all because my boots were to big then I went and got fitted with footbeds and everything and I was soooo much easier because I could actually apply pressure to my tips and tails without hurting my feet and shins.
If you have sloppily fitting boots (they're to big) your feet are gonna be moving all around inside the boot and when you push forward to do nose butters your heels are going to lift and your toes will slide back which is very uncomfortable and is bad for butters and control. And when you lean back for tail butters you'll just get sore shins. Also you want a medium-stiff flex I'd say 90+ flex but it varies a lot based on your weight, height, ability and ankle flexibility as well as the actual brand of the boot. Having a stiffer boot will provide more support allowing you to really push all your weight and strength onto the ski.
ski_da_powyep, listen to this guy. i should be in size 27.0 boot, but im in a 28.5 and i have massive shinbang