I bought a couple from TW and they showed up yesterday. On mine there was a minimal amount of primer. After only two no-inhale hits I was smelling my juice's flavor, so I started vaping. The vapor was slightly warmer, vapor production was slightly increased, but the big difference I noticed was in the flavor. There was a big step up in flavor.
I continued to use the LR and standard unit side by side for the rest of the day. The LR continued to out perform for the remainder of the day. This morning, same thing. SO, I'm liking them so far, but as others have said, they will only be worth it if they last a reasonable amount of time. Time will tell.
I measured the resistance and the LR came in at 1.8 ohms, compared to 2.2 ohms on a standard unit.
The only negative I found was the little devil head logo TW puts on it. Once everyone is selling them, I'll look elsewhere because of that. I was thinking I might put some black heat-shrink tubing on it and also on one of my beat-up looking eGo batts, that should look nice.