Ok, a bit now from a tootle puffer who's been using ego twists for 2 years and was looking for a battery that would last longer than the majority of a day (900/1000mah) and still be small in size...
I received my 50W iStick from Vaping Zone on the 15 mil post prizewinners thread on Saturday 6/13/2015, charged it up and it lasted me until about 1pm Thursday 6/18/2015 - talk about being AMAZED!! almost 6 full days? I've never used any kind of mod before (other than a Vamo which for this 70 yr old gal was just too BIG!)
I've been quite happy with the 50W, it's size, weight, performance, ability to lock what I choose in voltage, and turn it off and on when needed in my purse, rotating the display for my likes, seeing the battery symbol for how much power I might have left, etc. I did have two atomizer heads in my GS H3 (tanks) that wouldn't fire ("no atomizer" on screen), so I swapped them out for new heads and things worked well again. I've basically been using inexpensive clearomizers as well - some EVODs, and a couple others I found didn't work or last long enough... might now be interested in a nice tank to go with the 50W that is easy to use (I'm not a cloud chaser, nor a sub ohmer, nor a dripper) - keep it simple and I'm happy (grin).... Sorry to hear that leadpipe58 didn't have as good an introduction to these iSticks.
Now, on to figuring out what I'm being told on the screen between the battery symbol and the voltage I've chosen - regarding ohms and wattage... ????