I'm very happy with the ZMAX Larry, $120 from ecigmodshop, arrived next day.
The Ohm checker is great fo gennys, I set mine to show Ohms when I hit the fire button, so when your nursing a new coil and wick you really know whats going on (in addition to taste and vapor production of course).
The power is not so much inconsistent as it is just plain inaccurate. Stoney posted some figures about indicated Watts vs true Watt and the Watts indicated by the Zmax started by underestimating output and then on a sliding scale to underestimating output. Basically in 18650 mode 6-12.5 watt true 3-15 watts indicated.
In double 18350mode 8-21watts true 3-15 watts indicated.
So once you get a feel for it it is a great performer, smaller than expected and very solid in it's SS finish.
I use the ultra bright blue Led display as a torch to find my keyhole in the dark when I return home at night Too! LOL
So if you ignore the scale and just use it as a guide it rocks