Before I get into the review, will first post the links to the vendors the two mods were purchased from was purchased from. Bought the Sigelei zmax 2 weeks ago from here- Welcome to VariTube.com - A Better Alternative to Smoking Smoktech zmax from here- ElectronicStix.Com · Welcome There is only one apv I can honestly compare this with, and that's the smoktech zmax version 2. While they both share the same name, and same hardware, what differs is the build quality and price. Will first go into on load number comparison- Smoktech zmax wattage testing with a single 18650 and 2.5ohm single coil carto- With RMS on- 3w- 2.77v, 1.1a, 2.5ohms= 3.06w 6w- 3.96v, 1.58a, 2.5ohms= 6.27w 9w- 4.79v, 1.91a, 2.5ohms= 9.17w 12w- 5.46v, 2.18a, 2.5ohms= 11.92w 15w- 6.09v, 2.43a, 2.5ohms= 14.83w Without RMS on- 3w- 3.36v, 1.34a, 2.5ohms= 4.51w 6w- 4.29v, 1.71a, 2.5ohms= 7.36w 9w- 5.13v, 2.05a, 2.5ohms= 10.52w 12w- 5.89v, 2.35a, 2.5ohms= 13.87w 15w- 6.22v, 2.48a, 2.5ohms= 15.47w Sigelei zmax wattage testing with a single 18650 and 2.5ohm single coil carto- With RMS on- 3w- 2.76v, 1.1a, 2.5ohms= 3.04w 6w- 3.94v, 1.57a, 2.5ohms= 6.20w 9w- 4.80v, 1.92a, 2.5ohms= 9.21w 12w- 5.46v, 2.18a, 2.5ohms= 11.92w 15w- 6.07v, 2.42a, 2.5ohms= 14.73w Without RMS on- 3w- 3.38v, 1.35a, 2.5ohms= 4.56w 6w- 4.29v, 1.71a, 2.5ohms= 7.36w 9w- 5.12v, 2.04a, 2.5ohms= 10.48w 12w- 5.87v, 2.34a, 2.5ohms= 13.78w 15w- 6.21v, 2.48a, 2.5ohms= 15.42w As we can see with the single 18650 battery almost exactly the same results. On to the stacked set up- Smoktech zmax stacked 18350's wattage numbers- With Rms on, 2.5ohm single coil carto- 3w- 2.81v, 1.124a, 2.5ohms= 3.15w 6w- 3.98v, 1.59a, 2.5ohms= 6.33w 9w- 4.84v, 1.93a, 2.5ohms= 9.37w 12w- 5.54v, 2.21a, 2.5ohms= 12.27w 15w- 6.21v, 2.48a, 2.5ohms= 15.42w Without RMS on- 3w- 4.12v, 1.64a, 2.5ohms= 6.78w 6w- 4.63v, 1.85a, 2.5ohms= 8.57w 9w- 5.44v, 2.17a, 2.5ohms= 11.83w 12w- 6.11v, 2.44a, 2.5ohms= 14.93w 15w- 7.03v, 2.81a, 2.5ohms= 19.76w Sigelei zmax stacked 18350's wattage numbers- With Rms on, 2.5ohm single coil carto- 3w- 2.82v, 1.12a, 2.5ohms= 3.18w 6w- 3.97v, 1.58a, 2.5ohms= 6.3w 9w- 4.84v, 1.93a, 2.5ohms= 9.37w 12w- 5.52v, 2.20a, 2.5ohms= 12.18w 15w- 6.22v, 2.48a, 2.5ohms= 15.47w Without RMS on- 3w- 4.13v, 1.65a, 2.5ohms= 6.82w 6w- 4.63v, 1.85a, 2.5ohms= 8.57w 9w- 5.45v, 2.18a, 2.5ohms= 11.88w 12w- 6.10v, 2.44a, 2.5ohms= 14.88w 15w- 7.05v, 2.82a, 2.5ohms= 19.88w Again the difference is so slight it's safe to assume they use the same chipset. Another item in common is the button, on both the Sigelei and smoktech zmaxes they're so close in feel and function it's hard to tell a difference. The screens differ though. Instead of a standard LCD readout, the sigelei uses a white OLED. It's very clear and easy to read, and not overly bright. The little issues with it are some of the words are cut off on certain menus. A small amount of scolling or a using a shorter word would fix this. As Pbusardo sir's video shows the other issue is the triple word scroll when switching it to the resistance display option. Now to get to the three biggest differences- durability, build quality, and price. Durability and build quality go hand in hand. The better's it's built, safe to say the more durable it is. I've only had it for two weeks still unsure of the long term durability, but having said that though have already dropped this pv more times and from higher altitudes in comparison to the smoktech one, and only damage taken was a slight scuff on the extended encap. My smoktech zmax's screen cracked when it fell over on a table (not off the table, just on. It literally fell the length of the pv). In comparison the sigelei zmax is a thicker walled, slightly larger apv. The cost of this is the sigelei zmax is heavier, larger diameter, and slightly taller than the smoktech zmax, but also means it can take more of a beating theoretically. Will touch up on this review again in a few months to update the long term use results. Another key thing to mention is on the smoktech zmax the grooves had an edge sharp enough to cut your finger on (at least mine did, cut to prove it). This gave it some extra grip but at the colst of blood. The sigelei's are perfectly smooth and aligned with the button. Some might complain it's overy smooth (can be slippery if your hands are wet), but that's an item up to personal taste. Will lastly touch up on price. From the vendor I linked at the beginning the price for a complete kit is 89.95, 72.95 for just the unit itself. Full kit is $5 more than, and the stand alone is almost $15 less than the cheapest stand alone smoktech zmax I've seen. You would think the more durable apv would be more expensive, but in this case it's the opposite. All in all, if you're in the market for a zmax, have to recommend the sigelei version over the smoktech. While it has a few quirks in regards to the screen and menu, it's simply a better built apv.