I am still using my mega vivi novas by vision over 2 years later. One of my best purchases ever and I still buy them. I haven't had as good a luck with the mini due to some leaks and they are a bit harder to fill due to the small size. I dryburn and rewick mine all the time. I use the kayfun also. Here is an old video.
https://www.youtube.com/watch?v=k6_b-uUKVJg
That's a great video, but IMO Phil doesn't really show much of the dry burning process. This one goes into more detail and the guy uses a somewhat dirty coil so he has to dry burn it a while. It's not a VVN, but the dry burn process can be done with anything that has silica in it and if it has cotton or rayon you just have to take out the wicks, dry burn the coils alone and put in new wicks afterwards.
The good stuff starts at 11:10. Note that if you keep the PV on too long you'll melt the coil and it's toast. I did that once and then it never happened to me again. Also, you need to keep going until all of the coil is firing red or it's not completely clean. I keep checking the clearo temperature with my fingers and when it becomes too warm to comfortably hold in a snug grip I leave it for a few minutes until it's almost room temperature again.
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