I have 2 MVP 2's that I started vaping with. They still hold a full charge & work fine. I don't use below 13 watts any more, so all they get used for is dry burning & ohms meters. I also have 4 Hana Modz. 2 DNA 30's (moment of silence for the one I killed by putting the battery in backwards), & 2 DNA 40's.. All single batts. I've had no problems with them at all, but then I don't monitor voltage drop & all that. If I look at the screen & it's all good, I just vape. Same builds all the time. Same Kayfuns, & occasional Nautilus or K1, & Magmas for tasting juices. I don't need much variety device wise. I have a couple of iSticks for the small form factor when I'm running errands & such. So the Evolv & whatever are in the iSticks are the only chips I have any experience with. I doubt if I would notice the difference between those & any other chips. I don't mind building coils, rewicking, charging batteries, cleaning 510's. But smoking was much easier. If vaping becomes a chore, or pita to do, it would be too easy to go back to smoking. As much as I would hate it. I have all the toppers I think I could possibly ever need. I want more vw mods, but will only get US made & repairable, other than the little iSticks. I'm not even sure about what other chips are out there. I just want to vape simply, safely, & steady.