Obviously Vaporshark is going to market them for the device they sell, which is DNA40 based 
They will work fine in the SXmini M Class as well
They will work fine in the SXmini M Class as well
It's an ni200 coil. It will work with the M Class. They probably haven't updated the description because when they released those coils the DNA 40 was the only legit temp sensing mod out.
This is their description for the new Atlantis coils.
Aspire Atlantis Nickel Coils (5 Pack) - Atomizers - Advanced
I make all my coils with a twisted nickel/kanthal. Temperature control works with it and the wire is easier to work with. Use it on my marquis rda, freakshow, kanger sub and my Kayfun 4. The key to nickel on the Kayfun 4 is to fill & adjust juice flow the device. If you adjust the juice flow on the mod, the ohms reading will be thrown off.
And frankly, even with regular nickel there's so many variables between builds, atomizers, mods and connectors that we're just ballparking, not getting ultra precise temps.
It's an ni200 coil. It will work with the M Class. They probably haven't updated the description because when they released those coils the DNA 40 was the only legit temp sensing mod out.
The Atlantis coils were released on April 17 if they interest you....Nautilus earlier.......... .see facebook.....
https://www.facebook.com/vaporshark
Yep, I ordered them (Atlantis coils) the day they came out.
I've been waiting , seems like forever, for the Atlantis ones....interested to how they pan out.... please let us know what ya think...
I have been using the RBA and the prebuilt NI200 coils in my Kanger Subtank Mini and have had a very reliable result on 2 coils so far. I switch out between both and also the RBA on the Delta II and enjoy them all. I just received the Lemo 2 and hope to get the best results yet from it once they complete the cleaning cycle in the ultrasonic bath.I've used the Aspire coils in the Nautilus mini and the Kanger coils in the Subtank nano. Both worked great for me however some say the Kanger coils don't work so well in the mini and the full size Subtank....and some also say they don't work well in the nano either...
Crank the temps on the DNA40 devices, should get you closer to what you're getting out of the SX.
Other vendors are carrying them also..Obviously Vaporshark is going to market them for the device they sell, which is DNA40 based
They will work fine in the SXmini M Class as well
I've noticed this too but I'm using them on a VCT Mega. Flipping from a Alien rda to Kayfun rta my settings usually stay the same but when attaching the VCT w/ ni200 coils I had to jump the temp and wattage up to get it to work properly. That said maybe its just the GCT coils but I'm not feeling them all to well but heck I got back into rebuilding RTAs when they were collecting dust before lol.So I have Smok GCT/VCT and VS Atlantis coils, both good so far. The smok coils tend to run high so there might be a long leg in there somewhere. but they work just fine. big vertical coil.
the gimlet is an excellent tank option IMO. i find the air control on the atlantis and subtanks to be too bipolar for my liking, the gimlet has four nice evenly sized inlets.
My nickel sub tank coil work amazing no problems what so ever, amazing flavor going on day 12 same coil.I'd stick with the Nautilus TSC coils. I've been using them daily since they came out at the beginning of December without any problems. I have not tried the Subtank nickel coils myself but I hear some folks have had trouble with them ...
Kanger subtank TSCs | E-Cigarette Forum
I can't. I can't even hit 410F at 40watts. I put it at 450F and still can't come remotely close.
go higher. the atlantis coils can be overpowered with 40w so there's no reason why you can't get a similar vape.