I just got my stealth battery (camouflage and gold - was a little worried at first but I love the color). It looks so good with my gold carts! I was also worried the XL was going to be too long but it's really not that much longer than the normal XL.
I can tell that it has an improved draw. The power of this ecig feels stronger. I'm not very good at explaining, sorry. But I highly recommend it.
Now to figure out how to organize and differentiate my carts...my next project.