From my own experience, I went from 7g a week with combusting, to 3.5g vaping with the CRZ. I am now averaging 2.5g with the UD. That's without any effort on my part to conserve and medicating several times a day. There's a lot of variables (mainly the quality of what you put in), but if an efficient powerhouse is what you're looking for, you found it. With the regular glass stems, I noticed a higher air to vapor ratio than I preferred. The high temp o-rings should fix that issue though. I haven't tried them, but I'd bet a fully loaded stem and one of those o-rings would be monstrous clouds. I came from the Zap family so I was used to the SS tip. I use the SS tip with the GonG stem and am both a dry and wet daily user. The SS tip allows me to load very small amounts (if you're a combuster, think one-hitter bat loads, but a little less), and get huge clouds. By the time the flavor is gone, the load is spent and a deep chocolate color. 1-2 of those to start, and then I just load and hit as needed through the day/night. Take a hit, set it down, and come back to it as needed. For efficiency and vapor density, I highly suggest either the nylon w/ SS tip, or my favorite, the GonG w/ SS tip (you can remove the SS tip and use a basket screen, or vice versa, so it's very versatile). If you're new to vaping, try one of each and I dare you to NOT have fun deciding which one is your favorite. Welcome to the pack. I've had mine for a year now. 24/7 except for a few power outages, and it still looks and performs like new. The only urge I have for other vapes, is more Underdogs.