Good post, Kia! A few years ago I started vaping, but with a 510 slim batt and only lasted a little over two months. I went back to smoking, but still vaped occasionally. Then last May I decided to try again. I was advised (not on ECF) to get an eGo and I did. Also got a couple of Rivas. I used them with the eGo tanks and then cartos. I still was struggling because I hated those fat batts and the buttons. Fortunately, after a couple of months, I found the Volt and switched to them. I love the slim Volt!!! Having to charge them more often was worth the more satisfying pv. The batts perform better and the SI carto was a quantum leap over the 510 cartos I was using.
I have two of the x2 batts and two clearos and I like them, but they will never replace my slim Volts. They're nice around the house and I think part of it is just having something different added to my arsenal. New toys, so to speak. lol There is a stronger flavor using the clearos. I think the whole cartomizer thing is evolving and we will see more changes as they are improved.
My favorite pv remains the slim Volt. It's small size and ease of use can't be beat. The x2 with a clearo on it is elegant and stylish looking, but I still take only the slim batts when I go out. SI has been giving us more and more options; I can't wait to see what they come up with next!
thanks 
