It is totally a personal preference thing.
I've been using the genuine Vivi Nova's for 11 months now. It is the large 3.5. Why they call it that is beyond me, you can never fill it up enough to get that much in it. The lines only go to 2.8ml. I've never had any problems other than first learning its quirks. Now if I get a gurgle, it usually means the head needs changing. The coils are too gunked up enough to vaporize the liquid fast enough. So, time for a clean head. Rinse the old one and put it with the rest to be dry burned on Friday, my maintenance day.
Can't say I've ever had a dry hit, but I generally play with my ecig while sitting and doing whatever. I'm still using a couple that I bought way back then. I lost two due to dropping them. One broke in the threading in my Provari the other bent and didn't work anymore. I have 4 that I rotate and about 30 heads that I rotate. I have 3 heads that have died and are waiting for me to get the nerve up to rebuild.
I have not tried other devices. I'm a simple kinda girl. I found what works for me and not interested in trying different things. I know how the Vivi nova works and there is no guessing as to what the problem may be any more.
Good luck on your journey!
