Aye, Vaporesso does make serviceable gear. Tanks are good as well, CCell coils (GT Core) could be a lot better though. As they don't wick as well as they should, this causes them to burn out before they should and on some of the most recent I've used I've been getting an acrid burnt rubber taste (insulator burning?).
So Vaporesso may need to look into things and possibly consider using FKM or FFKM for the insulator, as what is used for the insulators on Vaporesso coils
@Vaporesso_Chelsea?
Still have a Switcher at one side that was bought to replace a dodgy SMOK Procolour, it still works without any issues. It's a pity firmware wasn't updated enough, as the lowest wattage you can set in TC mode is 30 watts. And at 30 watts it's not very useful for high ohm coils (nearer 1 ohm and higher).