I just received a Provari mini having only used standard 650 mAh EGO batteries for 5 months. I've only had it a week now so can't give a lot of info... the build quality is of course great, the 18350 battery lasts me about 6-7 hours, the low battery warning (flashing LED) is a bit annoying as it carries on even if you turn it off. I like being able to check the resistance before I set the voltage. And I have tended to keep the Provari for home use so far.
Ultimately I think the reason for buying is just as important. I didn't make the decision and spend the money because I was unhappy with the eGO batteries or vaping experience I had with them. It was really based upon the knowledge I was going to experiment more with different clearo, carto, tanks and ultimately rebuildables so I felt confident the quality, flexibility would support me long term as I go from just vaping (to be smokefree) to it becoming more of a hobby.
Whatever your choices. Good luck.
Nib.