The Taifun GTR has an unusual airflow - you have the choice of opening one of two airflow holes under the coil or both. Both holes will give an RDL vape, choosing to have one of either of the inlets open will provide an MTL vape - if either of the two hole sizes don't suit you for an MTL vape you're pretty screwed. Also the air inlets aren't directly under the coil - there is one at each side, apparently the air inlet holes are machined to direct the air to the bottom of the coil. I'm not convinced the airflow machining works as I couldn't get much flavour from the thing in MTL mode although it seemed good as an RDL vape.
The tank can feel rather wobbly as it seems to be held by an o-ring. It doesn't leak and I had no problems whatsoever resulting from the 'wobblyness' of the tank although it did take some getting used to - I recommend you watch Todd's review as he explains it far better than I can.
I like a loose MTL normally with a 1.5mm air pin and both choices of MTL airflow were too tight for me - a lot of people seem to like the GTR but I'm not one of them because the choice of MTL air inlets just didn't work for me and got rid of it very quickly. I can't comment about the other tanks you've listed but if you're thinking of a GTR I'd definitely make sure the limited MTL airflow options suit you and pick up a clone just in case.
