When I started vaping and done some research. I found that the ego-t type b was the thing I needed. It holds 2 ml of juice which is going to last a while. Just pop the top off, fill, and your good to go. BUT, as with most other pv's. There's some tweaking involved to make it last and capable of performing at it's peak level just like any other pv. Some don't like it because of that fact but they seem to have no problems tweaking other mods and pv's...
Overall, I still use it. Even though I have two Reo's now that I use most of the time. With the type b model, it seems to bring out flavors that dripping and bottom feeding can't. Also, with the 1000 mah battery, you can use it for almost the whole day.
So, I would definitely recommend the ego-t type b which would be a step up from what you were using. Personally I HATE cartomizers. It's more of a hassle than a tank. Seriously, even filling it annoys the hell out of me.