I have used a melo 2 for a short time. It was given to me when I started to vape. I haven't used it in a while. I bought a super tank mini that uses the same coils and enjoy it more. Also the coil life was a little longer. I was getting 5 to 7 days at a max on a coil with the melo 2.
I have the Melo 3 mini( came with the Pico) and I like the Tobeco Super Tank Mini so much more! Both use the Atlantis type coils, I actually like the Tobeco Coils(.5Ω) as much as the Atlantis and they are cheaper.
I hate the air flow control on the Melo 3, can't tell if its full open, closed and find a sweet spot with it! When you refill the tank and screw down the top it affects the airflow, sometimes shuts it off, seems like I am always playing around with that tank!
The Tobeco STM on the other hand has an excellent air flow control, just love the vape of this tank!
The only problem I had with the Tobeco STM was getting the tank apart for the 1st time- yikes- it felt super glued on! Had to watch a you tube video on it!
Put the tank on a beater mod- slid the tool they give you with the tank and twist hard! After I got it apart I lubed the orings with some eliquid and have no problems getting it apart anymore! They only way to change the coil is to use that tool to get the bottom off!
I have the Atlantis Evo(extended) tank and it comes apart like the Tobeco- I like that tank too and it uses the Atlantis, Tobeco, Eleaf Melo coils too.