I haven't used their battery, but I've tried cartomizers from Red dragon, Bloog, e-cig.com, greensmoke, and I have an order coming from Smoke 51 right now. So far Greensmoke are FAR AND AWAY the best cartridges. all the rest seem to be resales of e-cig.com (for twice the price) except Bloog, whose carts seem cheap and don't last very long.
As far as batteries go, $50 for one battery is really steep, especially since it looks just like the e-cig.com battery that runs for $15. I got my first kit from Bloog and I have to say, all batteries are NOT the same. The Bloog battery doesn't have the longest life, but the air holes in the threading allow you to adjust the smoke density to suit your preference (assuming, ironically, that you're not using the Bloog cartriges). Also, the Bloog battery doesn't have that ridiculous 3 second cut off time (closer to 5-7 seconds).
In short (HA!), it doesn't seem to me that one company has a complete solution just yet, but that it's a mix-and-match situation.