I second Uwell Crown... best tank hands down, top fill, quality build 9/10, and factory coils last and are inexpensive! Great in Temp Control Mode, Great with 0.25 Power Coils. Only flaw i've found is that the drip tip gets a little hot if you chain vape and the 0.5 coils at half power, 60 Watts, they ended up only lasting me a week with great flavor. The 0.25 lasted me 2+ weeks and always gave great flavor at 80 Watts. Also i use 100% VG and never had a dry hit from the regular coils or nickel coils. Last thing is the price, $29.99 IS A STEAL for this tank and it comes with 3 coils, 1 0.25 pre-installed, 1 0.5 in the box and 1 0.15 Nickel Coil and an extra glass tank.
By the way build quality really is the best, i dropped this straight on tile and a couple times outside on the street side walk and no scratches or cracks.. its crazy.. i feel like i could drive a truck over this thing and then pick it up and screw it into my mod and it'll be 100% unscathed.