I just found a review dated Aug 2016, so somewhere in that time frame, give or take a couple of months I guess. BTW, the OBS Engine is a dual coil outfit, so not for me, as lately I like to stay 10.5w or less in power, I am doing more Tootl'in than Womp'in. I've found that I do just the opposite of most folks, most start off Tootl'in then graduate up to Womp'in and more, and start off MTL then graduate up to DL, me I go backwards it seems. I started off Tootl'in then have gone to, wait, what is less than Tootle Puff'in ? That's it, I'm now leaning toward being a "Minimalist Tootle Puffer", like some of you's are already. Minimalist as in 5 to 8 watts, single coil, single wire, single battery, no clouds just a thick mist type of vaper.