the hot metals are super nice. the 4 and 5 iron particularly feel incredible but the whole set is nice. i have nippon 950 stiff in mine and have been able to hit them a couple of times so far and they are awesome.
also did you get to hit the GW for the mizuno set? it's made to match the rest of the set but it's not made of the same stuff as the irons. it's super easy to hit.