Received my Wotofo Serpent Mini. Single coil, tiny, 2.5ml I think. I had no leaking on my first build. It wicks well, has surprisingly good vapor production at as low as .7ohm@25watts, and has great, great flavor. Looks good on my HCIGAR VT75 Nano. The low wattage is a nice way to extend the life on the battery thirsty DNA75 without going too high on the resistance (higher ohms but dual coil maybe?) that it goes into protect mode and won't fire. I'll try to add a pic of the Nano and the Serpent Mini when I get home. It's a great setup for taking to work if you work in an office or just want something small for on the go.
I also rewicked my Tobecco Super RTA 25mm, and I might have overstuffed it the first time. It wicks much better and vapes smoother now with less popping. It leaked a bit more when first built, but it's been fine for two days since.
Really happy with the Serpent Mini. I'll be looking at getting the 25mm version eventually. Receiving a Mage later today!