I ordered that overpriced variable thing on ebay today. Along with a car key fob battery for pocket/cartridge protection. Have developed a strain of VAS with these gizmos.
PCKT was my first, but had cartridge fit issues. Then CCell Palm, my fav, and then the tiny little guy rebranded by Elm&Owl for $20 from vapepartsmart. It has three voltage settings, and wide opening, and direct screw in, no magnetic adapter to lose. (threw a PCKT magnet in trash with a spent cart) Don't like the ergonomics of the Elm&Owl though, especially the finger yoga to press button. CCell Palm sits by my side, obediently ready for an inhale, no buttons. Era was king, but pod availability has been an issue here. Showed TightPac in pic because it's a great pocket travel case for Era with pod. Can remove lid, hit Era. Been enjoying Select brand carts, Palm temp seems fine.