I own this Drag mod and I have to say that I am pretty impressed with it. Comparable to my DNA and Joyetech devices running arctic fox.
That said, the only downfall I see with this mod is the lack of coil resistance refinement or correction. Meaning it does not check the coil resistance over time to confirm that the initial resistance is correct. I have somewhat found a way around this tho. Build and wick your coil as you normally would, for me it is either 0.24 ohm for dual fused clapton 26 or 0.42 ohm for dual fused clapton 28 using all SS wire. Fire the coil until it hits temp control/limit, quickly unscrew the coil until the mod reads no atomizer and screw it back down. You should see the "new coil" message, at this point click + for new coil and 5 clicks to turn it off. Leave it for 10 mins or so and turn it back on, you will notice that the coil resistance has now changed from the previous "hot" coil.
The reason I posted this method or preform this method is so the mod can read a resistance with the tank already stabilized on the mod. If you simply screw down the mod, I personally am not certain or confident in when the resistance is being read. Depending on if it is read on initial tank contact of fully seated contact. This may not seem like much, maybe 0.05ohm or so, but in temp control mode this could be the difference between a hot flaming dry hit or a smooth vape. I have had nothing but smooth vapes and good results with this device.
@Labubs I would try the method I mentioned and see if it helps with your dry hit situation.
@Eskie @ShowerHead as for the TCR, I agree they are a little off. Keep in mind that Ni200 is 6000 and they are using 6500, Ti is is 3600 and they are using 4000. It is not that far off, I personally only use SS316L coils so I can not confirm how accurate these are. Also keep in mind a lot of mod manufactures do not even publish their TCR settings so for all we know they could be way way off. I remember Joyetech when they first release temp control, their default SS profile was unbearably hot and was giving me burnt/dry hits at 420-450F.
I am using the default SS316 profile at 1300 and I was a little skeptical at first but I am very impressed. It is a tad warmer than most default SS316 profiles but not by much. Phil B did an in depth temp and firing analysis on youtube (using the default settings) and his temperatures were within 10F (IIRC). His video is what made me pull the trigger.
NiFe52 is quite close in TCR to Ti and I have seen/read several ppl using it on the Ti profile and has had good results (in general but not with this mod)
I know it is a gamble purchasing something that you do not feel 100% confident with but that is just my personal take on this mod. But if you do decide to take the plunge, you can always play with the TCR settings until you get something you like or get a thermal coupler so you can test the temperatures yourself until you find an accurate TCR
