My first was/is a V1 chrome Vamo from okcvapes bought early on before the buzz got huge. Short spring, no gasket (I made one from electrical tape), reverts to 3.0 watts after battery disconnect.
Second is a V2 chrome VAMO from Healthcabin (which calls it an eGo Variable Volt/Watt). Longer spring, with gasket, remembers wattage setting when changing batteries. Also snagged a second end cap with the longer spring for my V1. Only cost a buck or so.
I'm not a big fan of the chrome (or the black chrome, either). Too cold, too slippery, and a fingerprint magnet. So, I downloaded the skin template and ordered two sample 4 x 8" sheets of 3M adhesive vinyl with a nice nubby pattern that looks like black carbon fiber. Cheap from eBay. Only $2.50 shipped, and enough skin to do about six VAMOs. Or two with my learning curve and x-acto hole cutting skills. LOL.
I run both in single 18350 mode. The trade-off of shorter length (which I prefer), but reduced vape time between recharges is fine for me. What the heck, an 18350 high-drain lasts 4-5 hours in the VAMOs, which is an hour or so more than an 18350 in my Kicked Bolt and an hour or so less than the 18500 in my other Kicked Extended Bolt.