I've been using the eSmarts on my G6 batteries for a good long while now, but I think I found a replacement...
GotVapes has their new 2014 Fluxomizers that are performing amazingly well. I had some flooding issues, but it seems to be resolving itself.
Should also note that they are 510 only, so you will need an adapter if you want to use them on an 808 battery. They also have a sealed bottom so will not work on automatics, you WILL need a manual battery.
Not perfect for an 808 battery, but they have outstanding flavor and vapor, and even when using an 510-808 adapter, they are still nearly the same diameter as the G6 batteries, unlike the e-Smarts.
I'm wondering if they will make an 808 version like they did with their Phoenix tanks.
[Edit] Talking to badkolo at GotVapes now about an 808 version and he's going to ask around to see if there are any plans for it.