The new Ikenvape xLR 510s are my current favorite. Great TH, flavor and feed performance. I've cleaned my UFS 3 times with this new atty, and upon inspection after a cleaning with just some water the coil and wick inside still look brand new. I don't know how that's possible, given every atty I have ever owned has a discolored wick after my first UFS/Atty cleaning.
In all honesty, it's not enough anymore to just have great TH and flavor, for a UFS the atties need to be weighed on how well they perform within a UFS (aka, how they feed). It's highly dependent on your juice, but for the thicker juices I used, the IKV's are amazingly good. My favorite prior to this was the HH. 357 from Cisco, and before that the Cisco LR 510.
My only issue with the HH .357 (aside from the price) is the fact that you're not supposed to EVER blow into the atty as it can ruin the "pump" inside. For me, that's a very common occurrence. If I over feed my atty I blow the juice in the atty into the collector tank and vape it back up from there over time. The Cisco LR 510s have great throat hit, and good flavor, but they wear quicker than my IKVs.
I never much cared for the Joyes, they didn't have the same taste, TH or longevity I've come to expect with Cisco and IKV atties.
Glad I stocked up before Isaac had his website issues.