Make sure you select the input at Display port 2, improves response times by disabling the other connections apparently.
These are my thoughts having moved from a DGM 1440P IPS screen.
1. TN sucks. I'm sorry, i like my new screen but don't let anyone fool you into saying 'this is a better than normal tn screen'. They aren't a patch on an IPS in terms of colour, accuracy etc. The difference is massive.
2. It's not all bad, the tn is more responsive. I can feel this playing bf4, as a result I'm doing better.
3. It's 4K, it does look awesome in games.
4. Overall i was a little disappointed, because I'm used to IPS quality and TN is a downgrade. However the fact it is 4K (and games look great) means i will keep it until a similar freesync (hopefully 4k and IPS) monitor comes out. I love 4K, but i miss parts of my IPS. I still have my IPS, but am letting my mrs use it for now.
5. If you're already a TN user then you won't feel the pain i did switching. If you're an IPS user, then you should be prepared for the downgrade to TN.