The INNOKIN products speak for themselves but this Cool Fire Z60 unit shouts perfection. The power unit (battery) shows you the wattage, the ohms, charge condition and even the number of puffs taken on a very cool screen. Safety isn’t forgotten either. In addition to the 3 click on and off there is also a master on/off switch. To top it off “all day vaping” is a modest estimate as I have not ran the battery down in one day since I started using it. I’m a moderate vaper and a couple days, maybe more, is what I’ve gotten. The Z coil Slide top atomizer is the best yet and I’ve been vaping since those little Starlight, colored plastic, learn how to take ‘em apart, wind our own coils and then throw them away because they then cracked and leaked from the get go. There has been numerous improvements thru the years on the atomizers, coil technology, etc. I love the slide top fill! So much easier than un-screwing and then screwing the fill neck back on, being careful not to cross thread it . So convenient. Unit comes with two different glass juice volume reservoirs. The replacement coils are reasonably priced and I’m still on my first one after 2 or three weeks use. I do prefer the 1.2 ohm coils over the .6 and .8 ones that came with the kit so do yourself a favor and pick up a couple packs of the 1.2. By far the best part is the air inlet and adjustment is on the top... finally absolutely NO LEAKING. One word of caution, the glass reservoirs are thin. I broke one changing the one it came with to the larger volume part. The larger tank bulges out past the width of the rest of the atomizer and battery and I think there is a good chance it would break if it falls over. I MacGyvered a stand out of a wire clothes' hanger but it would be nice if Innokin could make the tank glass a little thicker... The Juice I ordered from VapeSourcing is a 50/50 mixture of two tobacco flavors I tried from an earlier purchase. Naked American Patriot and Naked Euro Gold. I love it. One didn’t have enough of what I was looking for and the other had too much. Mixed together was just right. Around $12 for 60 ml, $11 on sale. Great Price No review would be complete without speaking for the service. Fast and courteous. Thank You VapeSourcing. MrTime