I found the Eroll to not be fiddly at all. Just fill a couple cartridges and vape. It seems like the Eroll would fit what you are looking for quite well. I have used all three that you are concidering, and the Eroll's performance blows the others away (IMO).
I will give it a try.
I want to settle on a single cigalike size device to reduce clutter and since it will only be used once in awhile.
