OK, I know I'm going to get shot down in flames, here, but I just want to ay that I am not being deliberately contentious, here. I just want to understand. Why is the Provari so great. There are lots of people who love them, I know, but there seem to be a lot of issues with them. Centre posts that are too long, end caps that are the wrong colour, error messages etc. And the devices are not cheap. I may end up getting one of these myself, at some point, so any input is welcome. I have an eGo Twist, stainless steel, 650mah, which cost me about £22. Maybe £100 less than a Provari. It seems to be easier to shift between voltages, it is more compact, and it definitely does the job. I am aware that some people like things for a 'quality feel', and I understand this (I like nice watches that don't tell the time as accurately as a Timex quartz, for instance). Is this part of the appeal? I know you can change the batteries, and I know your can get an extra 1.2V with the Provari. Am I missing anything else? I would love to know. Do Provari users regularly use above 4.8V? If the answer is just 'it's bigger' that is definitely not a selling point for me (I don't go for big watches, so I definitely don't want a big PV just for the sake of it).