I've had mine from FT for a few days now, cannot fault it, fit, finish, function, all exceptional. I would love to have the authentic, but jumping through hoops to give someone my cash just isn't worthwhile. I would agree the one FT seems to be selling is SXK, machining is quite nice on it.
Took me maybe 5 minutes to build it, works quite well, zero issues with hot legs, uneven coil heating, etc. I found it dead simple to build .28 gauge 1.1 ohm coil. Set this on its side overnight with a full
tank to see if it would leak, not a drop found the next day.