I don’t get any chaffing with mine. Guess I am just lucky.
You will need someone to zip you up at the race. So you need to make arrangements. The tear away zipper is awesome but I would still practice doing it.
As soon as you get done with the swim pull up the zipper and start taking it off. Do the tear of the zipper in one motion completely. You don’t want it to stop half way and need to pull the zipper up again in a location tough to reach.
I pull mine down to my waist and then off at T1.
I have been very happy with mine and now worn it for 5 races.