Thanks for the responses. What I was struggling to see was what was it about these that would appeal to a more experienced vaper. There was no way I would be digging out my 5 year old ego-t kit for example. However, I do like the idea of having a small back up device. I never generally bother taking a second when I am using a mech, but now I have started to use regulateds again, having the second as a back up could be handy. Might have a bit more of a read into these.
I don't know what it is, its more satisfactory than the old pen style kits and protank days. At least the myjet is.