Love mine. 650 &1300.
- charges in 3 & 6 hours. Awesome. Compared to x2 - 10 hrs.
- I sample tons of different flavors, and adjusting voltages really helps.
- I use a few different clearos, so again, flexibility is a big plus.
- the only downside is that 650 to 650, the spinner doesn't last as long, in part due to the higher voltage, and in part due to the nature of vv in general. Some energy is lost through the resistance in the form of heat. I notice my spinners warm up when used, even at low voltage.
All in all, love 'em.
EDIT: another negative is the cut off is 5 seconds, but not a big deal.