bad news is that the stock cracked after approximately 500 rounds. Sending back to CZ. Looks like a bunch of people on the intertubes also have had this issue.
Good news: Still loving the iron sights. They just work so well with the stock shape that it gets me into a perfect cheek weld and head position every time.
MTAC kind of sucks and am planning to sell for a Leupold 1.5-5. The glass quality just isn't that great.