This is probably what Sparta was referring to with "if the flex is right for you". If a boot is too stiff for you, it will not be good for any condition or terrain or ski choice. But if the flex is appropriate for you, it will work well in powder or trees or steeps or groomers.
As far as quality/durability goes, that is a good question to ask. Also, the boot does not have a walk mode, so that might factor in to your needs for a boot that can handle sidecountry.