I was kindly given a Kraken (not a recomendation, I am sure those in the know have better recomendations) by
@Tubbyengineer a year or so ago.
It required a new coil so I built a new coil round the existing wick and It was my main vape for the next couple of months. I thought i better learn to build my own mesh wick and that went well, that was me happy for the next few months (beginners luck).
The next time I tried a rebuild I went through a bunch of wicks and coils, and many hours over several days and it was hot spot hell. I will return when I have time on my hands, perhaps this winter. If i can consistently do good builds on my Krakens I could see that being my vape of choice , but I do understand why some people think genisis are the best thing since sliced bread and others think they are the spawn of the devil.
I suspect that initially they are not for those wanting an easy vape but may well be worth it if you master it.