So far i'm liking my rifle. Out of the box, the things i didn't like was the fact that the upper had quite a bit of wobble, no dust cover/brass deflector, its got a heavy/gritty trigger and i just realized recently that my gas block is touching the rail. I need to email kodiak about that. Another thing i wasn't really a fan of was the rail, though it does the job, i wanted something that matched the rifle a little better and a bit longer.
Having said all that here are somethings that i did:
1) I designed and made my own dust cover/brass deflector. I didnt like how there was a huge gaping hole on both sides of the receiver, so having this dust cover seals up the internals on one side at least, which is better than having that opening. The brass deflector made the gun a bit more enjoyable for me, knowing that the brass won't nick up my receiver

, some may not agree with this. But the most important thing is that the casings now, instead of ejecting backwards, eject forward at the 1-2 o clock position, which makes it more fun to shoot for a left handed person as well.
2) i didn't like the rail so i replaced it with a TNA mlok rail. With the new rail i'll need to see what kind of accuracy i'm getting. It looks like the gas block is still touching the rail so i'll figure this out when i hit the range this weekend.
3) Changed the stock and grip to something more comfortable. Currently using a mgapul ctr and a magpul moe K grip. With the moe k grip, it is a tad bit shorter than a normal pistol grip, so i do not recommend it to anyone with smaller hands.
4) I found the mag release button to be a tad bit far from my index finger. I found that i had to shift my hand a bit just to get solid contact on the button, so i added a magpul enhanced mag release button which solved this issue.
5) I added a thin shim (tape) to the lug on the upper receiver. Which fixed the wobble issue. There is a lug on the upper that fits into a hole in the lower and i found that the the lug is just slightly smaller the hole by 0.0050", which was enough to cause that amount of play in the receiver. The tape is just a temporary solution until i find a better one.
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With these upgrades above, the wk180c is almost set up to my preference, though i am missing a couple more parts at the moment but for now the rifle feels pretty good. I'll need to double check on the accuracy. Obviously, the gun will still work without the upgrades i listed, but the gun feels even better now with them so i'm pretty happy with it.
Is it worth it? In my opinion yes, because for the price you're getting a pretty decent rifle and the best part its NR which is nice. I would recommend it.