So after almost two weeks of using the Kangxin Flask, I'm still real happy with it, but I've noticed a few things:
1. It's sensitive to battery charge in TP mode. When battery level gets lower than about 40%, it takes longer to "ramp up" to your set temperature, correctable by throwing more wattage at the coil AND raising the temp limit a bit.
For example on a Kayfun V4 clone, 30ga twisted on a M8 (~3mm) machine screw, it comes in at 1.3 ohms, and gets me the best flavor and vape temp at 470F and 20w, with about a 1 to 1.5 second max ramp up to temp.
With weak batteries, below the halfway level on the indicator (and 40% or lower showing on my charger), I need to bump it up to 23-25 watts as battery level continues to drop, and need to set TP at 500F or a bit more to get the same ramp up time and flavor. I get similar results with a Subtank RBA, Marquis RDA, Rogue RDA, and my home-rolled Ni200 Atlantis and Subtank coils, needs more power and higher temp limits past the battery halfway point.
It's not a deal-breaker, by any means, and not as bad as a mech mod as the battery drops, just something to watch out for if you think your build is messed up.
2. Finish on the BB style buttons is not the greatest. Mine are almost completely down to the dull brass now and no amount of cleaning is going to bring that shiny silver back. Then again, I'm a bit hard on button finishes (and watch bands, and rings), something in my natural PH I reckon. But hey, dogs love the way I taste, so there's that.
3. 510 adjustment screw is too loose, it's constantly in need of adjustment even when sticking with a single atty. It's also at risk of coming out and getting lost, so keep that in mind.
4. Doesn't stay locked after it goes into deep sleep mode. When it wakes up and says "Hello", even if you locked it earlier, it will fire.
5. Locking the adjustment buttons always adds 0.1 watts, so if you want to lock it at say, 20 watts, set it to 19.9 first.
6. Top plate (part held on by the four T5 screws) on either end can shift with not too much pressure, giving you a bit of an overhang. Easy to correct, but it can happen again, since you really can't torque the screws down that much into the aluminum, and where Vaporflask decided to put the screws on the authentic just gives that plate too much room to torque. Ideally, they should have put the screws more outboard from the center.
7. 510 connector gets dirty, quick. No big deal with Kanthal, but it can be the difference between a bad build and a good build with Ni200, so keep it clean.
8. Bottom adjustment button on mine is starting to show signs of recessing into the housing. That worries me more than anything else about this device.