I'm not into rebuilding (yet lol) so for me it works just like I hoped it would. Idk if anyone would remember, but when I first started I had a really hard time with it. I was finding that I'm sensitive to metals, I couldn't find anything, especially a clearo, that would give me even a decent vape. The first month for me was so hard and it didn't even have anything to do with quitting, it was issues I was having with all of my vape gear. There was a lot of people who told me that if they went through half of what I went through in the first few weeks, they would have given up, but I was/am determined to make this work.
To this day I've still only meet one person who has the same metal issue that I have, I've heard of one other person, so it was one of those weird things where if there's a .0000001% chance of a negative effect, I had it! It's about that way in other aspects of my life as well lol. So for me, I've only ever been able to use cartos and for normal people, that would probably be ok, but at only 25 years old I found out I have Fibromyalgia, 2 fractures and a tear in my spine and arthritis in my knees, wrists and ankles! So sitting around a table, or even on my bed, trying to deal with a carto may not seem like a big deal to most, but for me it's painful, VERY painful! Needless to say, I am a tad more excited than the average person that this tank is actually working for me lol.
Anyway, I'm sorry you didn't enjoy it as much as I do. I did see the issues people were having with the installed head (mine came with 2 as well) and just hoped it wasn't an issue for me and I guess for once, I lucked out.
PS If you ever wanna sell that stuff, let me know

lol