Picked up two mini's and some additional replacement heads about 3 weeks ago and am really enjoying them. However, I'm finding that they are not the 'plug and play' tank that some people are enjoying. I much prefer the 1.8ohm heads over the 2.4ohm heads over all voltage ranges, as mentioned a few pages back the chocolates needs a substantial increase in voltage compared to the fruit or menthol flavors, and I like to vary the air flow using a 'c' cone on the twist for different juices as well.
I'm actually considering all these things as a positive seeing that I'm able to easily alter performance to my liking. The point to that horrible run on sentence is not everyone likes them dropped on at 4.0 volts. My initial impression was that they sucked, but have been rotating the two nonstop ever since after playing around.
My experience and YMMV.