I am partial to the T3 myself, after First Gen CE4 and a Kanger T2 (CE5 Clone), I moved to the T3 by recommendation of another vaper. I do have a Protank and a couple Evods. If you want to move that way, is your priority, though I keep my protank around just for plastic tank melting/cracking juices as well as a Pyrex SmokTek DCT. If you are already rebuilding first Gen T3/MT3 heads, rebuilding a protank or Evod head is much easier as you don't have to get down into the Ego Thread cup to nip off the excess wire of the legs. Protank, Evod, and the new generation T3S/MT3S, are extremely simple to rebuild because the head comes away from the base as a sepperate screw in piece, so if you like you T3, it is relatively cheap to upgrade them to T3S as the bases and heads can be bought sepperately and fit nicely into the first gen T3/MT3 tanks. The heads also can be used in a Protank and Evod, Protank and Evod heads can work in either Protanks or Evods, but they will not fit into the T3 tank, flange below the wick/coil are just a smidgen wider on the Protank and Evod heads compared to the T3S/MT3S. Gotvapes.com sells first gen T3 and MT3 tanks, T3S heads, and T3S bases sepperately as well as First and New Gen T3/MT3/T3S as whole units. If you are using your T3's on an Ego, Spinner, or Winder battery, might be time to invest in an Ego lanyard, has a collar that fits under the tank base at the buttom assembly, and attaches to a lanyard via a lobster claw clasp, save ya from busting more tanks ^_^