I think it's a bit sad that all the premium, smaller and older manufacturers of MTL tanks, have fallen so back nowadays.
Imeo still make atomisers with metal or plastic bodies, still not the easiest tank to fill and insists on that rotating juice control, which you shouldn't need if you've designed a good atomiser.
The Origen Tiny Tank was one of my favourite tanks but it was a pain the ... to fill and came with a plastic body. Norbert then came out with the 19/22, which is too tall imho, still plastic body and not as good flavour as the tiny tank.
The Rose 3 was is very good but I get condensation, leaking from the AFC and bottom of the 510 like I did with the V2.
On the other hand, the Digiflavor Siren is an awesome MTL tank, pretty much flawless. It's made in China, with really good build quality and it costs only 30 dollars...