I have both the PT2 and the PT3. I remove the flavor wicks from my PT2s on first cleaning and install cotton flavor wicks. I have been using the PT3 with the stock heads just as they come out of the box.
PT3 so far...
Does not seem to be a "warmer vape", I thought it did for a minute but side by side vaped the two with the same juice/settings and not much difference other than the PT3 is airier on the draw.
Does have an airier draw.
Does not leak, or gurgle. (none of my other protank stuff leaks or floods with real Kanger heads)
Not unhappy with the purchase (Caveat Below) but do not get the overall difference.
Caveat: I have a few Protank 2s and minis, I use the protanks for work and use RBAs at home. Just because I can lay the mod with tank down or put in a shirt pocket and not have to worry. I bought the PT3 just to try the new tank out but really wish I would have waited. Kanger has some new tanks out and will be shipping some time in the first quarter.
Kanger Aero - Dual coil evolution of the Protank series with adjustable airflow.
Kanger Evod2 - Dual coil evolution of the EVOD with adjustable air flow, with removable drip tip.
Protank 2 and 3 airflow control
and some other stuff.
Kinda wish I would have waited. I think with the amount of knockoff protank/evod series heads there are out there Kanger is rolling out newer stuff with different heads to get some more money till those are knocked off. I do not know that they can keep up with current items on the market much less totally new models. Time will tell. One thing is for sure this is a fast moving, rapidly evolving industry.
Edit: You can put single coil heads in a Protank 3. They do leak if laid on their side. Other than that they work.