lol - the folks at the vape shop may need to do some homework (or join this forum) - the Sig 213 will do SS TC as well as TC on Ni, Ti - personally, I find SS wire has a much cleaner taste and better performance overall in TC or in power modes
just remember to prime em well - and when you start using them, start at lower wattage/ temp, and work your way up to 'break them in' - also, AlienTraveler's point is spot on - when you first install the coil, lock the resistance on the mod
you can do this!