I have wanted to try one of these with the RES system for some time now but my wife wasn't having it since it's about $200 with a battery and shipping.I saw one on the forums for $100 shipped with a AW 17670 and the wife approved so I got it.After using it for almost 2 weeks I gotta say I really like the device and the way it performs.The mod is fairly small,lightweight and looks very hi-tech.The RES system took a bit of time to get used to,but once you get the hang of it your vaping experience will be great.It wicks the juice to the atty very well and adds no taste to the juice at all.I started at 3.7 volts with IKV 510 LR 1.5 attys and the RES was able to keep up all the time with no dry hits and good flavor and vapor.Then I vaped with 2-3.2 volt AW's at 6.4 volts with a IKV 3.5 ohm i06 and 4.5 ohm 510 and got great flavor and vapor and the RES kept up unless I chain vaped it.Then I would just give a quick pull or two without power and start vaping again.Last I tried 2-3.7 volt AW IMR's which gave me 8 volts under load with a Joye 510 5 ohm atty.Wow,almost too much for me,huge vapor and still nice flavor but too warm.The RES couldn't keep up with juice demands at 13 watts of power but then I didn't expect it to.I'm really glad I bought this and I would recommend it to anyone wanting a nice mechanical tube mod.