I have been vaping for about two years now. I have continued to use an ego battery, and currently I have a Kanger Protank 2 several Evod tanks, and recently purchased a couple of Evod 2 tanks to try them out. I love LOVE my protank, but I constantly have problems with leaking/popping etc...it makes great vapor and tastes great with my liquid I'm just tired of the leaking. I don't over tighten anything, I learned that quick, but I still have some leaking. I noticed with the Evod 2 it is hardly any leaking at all and that may be because it is newer/improved. I read the the Protank 3 has improved everything and there is no leaking etc, but they take the double coils and I don't want to change out all of my equipment. I love the simplicity of my set up so I do not want to drastically change anything. I would jump on the Protank 3 even with the need of the new coils, BUT I tried the double coils on the Evod 2 ( it can take the single and double coils) and I actually prefer the single coil on the Evod 2. So I'm concerned that if I invest in the Protank 3 I will be forced to use the double coils (unfortunately it does not take the single coils) and may end up not liking it as much. I'm not really sure why the Protank 3 can't take the single coils since the Evod 2 can, does anyone know? They fit the same in my Evod 2 tank. Basically I'm wondering if I can get this Protank 3 and stick a single coil in it anyway if in fact I do not like the double coil in it?