I bought the 901 from ecigsales.com I'm using the carts that came with it. Oh well, I still have the other battery, battery life is pretty good. Bought it cause it was cheap, and everyone reccomends 901's. I also have the Great White from there, it doesn't hold as much juice, but it gets a much better throat hit. Unfortunately, only one of the batteries works that came with it. The other one works, but seems underpowered, and dies after 20-30 drags. And they don't have any more batteries in stock. But the battery life makes it through most my day, and a full recharge is 2 hours.
Besides looking cool, I'm not impressed with the 901, throat hits are weak, atomizer was coated in primer, that I got rid of by boiling the atomizer, these cartridges are way to much work to pull off, the battery cuts off after 5 seconds, the battery on the great white cuts off after 10, which gives a solid hit, and that battery end easily ripped off.
But I ordered the Janty Dura-C, which should be amazing.