@jhkiefer impact vests are awesome for skiing! freedom, comfort, and range of motion is unbeatable. That being stated, none of them are going to protect you fully from a full knockout like a CGA can, I do not know of any current impact vests that will pass the final test in the CGA approval of floating you "face up." Also, there is always the risk of blowing out the entire zipper and coming completely out of the vest as there is only one point of attachment (the zipper).
Lots to say nothing is PERFECT (there is always risk) but I think you will enjoy your slasher! I have three in the boathouse myself ?