As soon as you'll have the berserker, please let us know who's the daddyThe OBS Engine Nano is the best in my opinion so far. No leak at all. I have the Berserker coming any day now also.

As soon as you'll have the berserker, please let us know who's the daddyThe OBS Engine Nano is the best in my opinion so far. No leak at all. I have the Berserker coming any day now also.
If I close the air on my 2 it restricts it 100%... Air Tight... It IS a great MTL tank. Ask others.Not arguing with ricks here, at all, as everyone has their own way of vaping. There's no right or wrong...but, most would say "no". There's no way the Nano is a MTL tank. I own one and there's no way to close the airflow down enough for a good draw. Add to that the chamber size and overall airflow design. Great single coil flavour tank for DTL, but not MTL.
Ask others who really own and use them. It is a great MTL tanki was only semi aware of the Nano from general browsing about and kind of assumed (without looking into it) that it was`nt MTL, i agree there`s no right or wrong way and whatever works.
If I close the air on my 2 it restricts it 100%... Air Tight... It IS a great MTL tank. Ask others.
I think you have a defective one if you can't MTL it.
You said "There's no way the Nano is a MTL tank"... I've just never heard anyone complain that it was not a good MTL tank. You are the first for me...I never said I couldn't mtl the Nano, I can. As I can with any number of DTL tanks. The fact that I can, however, doesn't mean it's a good MTL experience. There's more to a good MTL than airflow that can be closed down. If it works for your vaping style, great, I won't say you're wrong, but the Nano wasn't designed to do MTL and that's very apparent when trying to use it in that way. It meets your needs, but it won't for most who are looking for a good MTL vape.
...I found myself down at a 2.5mm ID coil, with a tiny little wick, and on 28g Kanthal at 1.8ohms. And it is glorious....
... and definitely NO TOP FILLING....
Its confirmed it leaks from top fill due to no jfc or shut off, shame it would be great otherwise ,Damn. If that turns out to be the case for the one I ordered yesterday, it'll be going in the junk drawer. That's the main reason I bought it, hoping for a good top-fill system without issues. Guess I'll find out....
After a few days use, here are my thoughts. I have a SS and a black one. I used the same build in both: 6 spaced wraps of 27 gauge kanthal, 2.5mm diameter, resistance about 1.10 ohms. No issues capturing the leads with round wire. Building was/is easy and quick, and so is the wicking. I used rayon and the liquids I chose were 70VG/30PG.
The black one, I top filled; the SS bottom filled.
The black one gurgled, the SS smooth as silk. The tanks lasted a full day in use. The black one I filled a second time, once again top filling. Top filling is a nightmare. The chamber flooded with liquid running from the airflow and seeping out onto the mod from underneath (airflow ring). The SS, bottom refilled -- no issues.
The liquids were custards and in my UD Bellus tanks, I usually get about 3-4 fills before having to change the wick due to coil gunk. The Berserkers: I couldn't even empty on the second fill since I could tell the coil was gunked. So about 1 1/2 full tanks. Most likely due to the heat in the tiny chimney chamber and frequent chain vaping.
I love the build quality of these, and enjoyed getting back to the tighter draw. But in future use, I have to use cleaner liquids, more fruits than sweet creams (less VG perhaps), and definitely NO TOP FILLING. An impressive little tank with a few caveats.