I'm holding out for popcorn that's not only burnt, but rancid too.Until then, nothing tastes anywhere near as good to me as the juice I mixed myself using flavorings from TFA.
I did a fair amount of reading before I embarked on the DIY journey and I particularly took to heart the advice of an experienced juice-maker in this forum who said to start with minimal amounts of flavoring.
Since unflavored juice was at the very least tolerable to me, starting with tiny amounts of flavoring was easy for me to embrace. Even when I used too small an amount for me to taste, I could still vape the result. Steeping, which is the action that takes place as the mixed ingredients get to know each other over a period of days, definitely improves flavors. Even when you're just mixing unflavored nic juice with more unflavored base, I think you'll find it smoother the second day than the first.
BTW, what/who is TFA?