Just finished a build in this case - an overall smooth process!
This is also a pretty good price- I’ll end up paying the same, but I have to wait for a mail in rebate (which reminds me, I should probably send that in…)
RGB anyone?
Here is the Gamers Nexus review. Their conclusion:
Don’t buy the 4000D. The 4000D Airflow, however, is worth consideration.
I saw that - the only difference between the two cases is the front panel, which Corsair happens to sell in their shop for ~ $15 after shipping (when it’s back in stock).
Until I get mine, I just pop the top of the panel off to increase the airflow if I’m doing something intensive (it snaps in).
Nice!!!
I was going to look up that same review, but you beat me to it. 
One thing about Corsair cases is they are very well made and you can get replacement or upgrade parts for a reasonable price. I have a 750d full tower and the latches for the front cover were bad and they sold me a new one for like 18 bucks. They also had the upgrade airflow front piece if I wanted to get it for a decent price so at least they support their cases well.