For the layman, if you don't have a
802.11ac router, there is no need for a wifi-ac card (802.11 is another name for Wi-Fi). More details about the differences
here.
Most people around here have only up to
802.11n routers anyway.
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Just got the two new Z5s we ordered last night. I bought mine mainly for development instead of for playing games, but here's my Z5 running
Divinity: Original Sin at Ultra settings.

I'm pretty much loving this. The cooling system is pretty much what I need in a laptop like this. I left my laptop turned on doing all kinds of stuff since I received it. I haven't turned it off yet, not even once. But I don't feel much heat coming from any side of it at all, only very slight warmth at the bottom.
The bottom pane feels a bit flimsy at times, but I really like how easy it is to open it up.
Definitely will recommend it to others. Will buy again in the far future once this laptop has worn out. All the best, Illegear!