The guy at my local B&M was using a subtank mini on his 40w tc with the nickel coil and it tasted amazing. Brought out a totally different note of raspberry in our favorite juice, ghostberry by steamjunk.
Made me want to get a TC device, but I am going to go with something with more power. I figure if I'm going to spend the money for a new TC device I might as well get something that has more power than I figure I'll ever need- looking at the IPV4S or IPV3 Li.