I received my Coppervape Dvarw MTL v1 clone two weeks ago and it is a fine vape. I'm getting great flavor and a nice tight MTL vape with the 0.8mm airflow insert installed. Also tried it with the default 1.0mm airflow insert (I measured) and that was nice vape as well. I have tried several different wire types all with good results. Works great with TC too. I've had zero issues with mine whatsoever.
Currently I have a 2.5ID 26g kanthal coil coming in at 0.7Ω and vaping at 22w. My coil is sitting 1.5mm above the air hole. I've tried higher and slightly lower and for me 1.5mm is perfect (same as my Kayfun Primes). It is super easy to setup and build on. Wicking is super easy and it doesn't matter if using cotton or rayon. It handles 70vg/30pg, 60/40 or 50/50 and it handles them with a breeze.
The Dvarw is a fine RTA and a flavor banger.
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... cheers!!!