So just a quick comparison here, rather than a full on review. I first bought the Profile RTA, as it was getting a lot of hype & I thought it could be a good improvement over my current tank at the time the OBS Engine 2. What I found was I enjoyed the vape I got from the Profile but it had side airflow rather than top airflow like I was used to. Along came the KylinM, a similar RTA mesh tank but with top airflow, so of course I had to buy this to try too. Size: Both tanks hold around 5ml, with their respective tank options( all my testing was in this higher capacity setting for both). The Profile uses a bubble tank, which makes it a few mm wider in its 5ml configuration, while the Profile uses a chimney extension & taller glass piece to get its 5ml capacity. Both also come with a TPD compliant 2ml glass tank section, which I have not used at all. Putting both side by side in their 5ml versions, the Profile is approximately 10mm taller, this is with both using the same 510 drip tip, using their respective 810 to 510 drip tip adapters (as used in my testing). Flavor: Flavor from both the KylinM & the Profile is very good, however after having used both for several weeks each, I think the Profile is very slightly ahead in this department. The very slight margin is, I think, testament to the efficiency of the mesh coils & both of these tanks have flavor in abundance. Filling: Here, hands down, the KylinM has it over the Profile. While both have top caps that you unscrew to refil, the KylinM has a wide fill port that even a glass dripper can sit inside, while the Profile has narrow channels that often make refilling messy. Airflow: Both tanks have ample airflow which is smooth, with no whistling. However the KylinM at fully open has a wider airflow, which may be useful to know for some vapers but for myself I has the Profile & the KylinM airflow reduced to my preferred draw. From my point of view, airflow is a draw, although if you like the widest draw possible then the KylinM is the winner here. Airflow System: The Profile uses a side airflow system, drawing air from the bottom of the tank. The KylinM uses a top airflow system, drawing air in through slots cut into the top of the inner barrel. My all time preferred airflow system is top to bottom to top, where air is drawn in from the top, to the below the coil & back out again, as I feel this has all the advantages of bottom airflow & top airflow. However niether of these tanks uses that system. Here though the KylinM performs very well, although the Profile gains an advantage to flavor from the system it employs there is very little difference in flavor. Overall though the KylinM is the big winner here too (see leaks below). Leaks: What makes a huge difference though is when it comes to leaking, because the KylinM has a top airflow system it does not leak or seep, at all, ever (as with all tanks this only applies when upright), while the Profile both leaks & seeps. This leaking is somewhat due to wicking, if you don't use enough wick in the Profile you might as well go pour your juice down the drain when refilling, it is that bad. If instead you add too much wick you will choke the juiceflow& get dry hits, dry hits on mesh are the worst you will ever experience, so finding the right balance is of utmost importance in the Profile when wicking. However even if you strike that balance, you will get leaks, especially when refilling, even with the airflow fully closed. I tried several different ways of wicking on both tanks but more so on the Profile & no matter which method I employed I would get leaks when refilling &/or spitback for the first dozen or so puffs. With the Kylin, no matter how I have wicked it, I have not had a leak nor any spitback after a refill ( I have had spitback when I didn't change the wick when I knew it needed it but that was my fault). So the winner here is again the KylinM (which is of course related to the airflow system above). Ease of rebuild/wicking: The Profile is not overly hard to install a coil on, however it is temperamental about how it is wicked. The KylinM is even easier to install a coil on, due to it's springloaded jaws & is not anywhere near as fussy about how install a wick. The KylinM is the clear winner for ease of rebuild. Overall: Both tanks perform very well, the Profile was released before the KylinM & the KylinM has obviously borrowed features from the Profile design. The Profile does produce ever so slightly better flavor, though you are really only going to noticce that when you vape them side by side & you'll be back & forth between them wondering if there really is a difference. The KylinM, not only borrowed from the Profile design but also from other tank designs, bringing a lot of great features from other tanks to its own design, as well as having its own innovations. So if you have read everything above, then it will be no surprise, that in my opinion, the KylinM is the better mesh RTA.