I have been testing out a few of the mini L88b e-cigs (blu, volcano, and the 510 which the parts are all compatible with each other *aside from the chargers*), with my own non-nicotine herbal VG based solutions for the past month and ran across the vape-pen site while digging for info. After testing out the mini's I already mentioned and learning quite a lot about how they function, I decided to take a chance and spend the money to get the vape-pen mini (out of curiosity mostly) even though the price was extremely high, and there doesn't seem to be any replacement parts available on their site. I noticed a lack of information about them on the web from people who actually use them, so I decided to be one of the first to test them out so I could give an honest report about how they function. While I was trying to find extra batteries that fit my L88b models, I ordered a couple of batteries from the Revolver e-cig site and realized they are not compatible with my L88b cigs, they seem to be the 84mm size, so I set them aside. Today I got my vape-pen mini ($80) kit in the mail which is also the 84mm size, it came with 2 (very sensitive) batteries that light up when handling the packaging, only one atomizer (which is the part that is bound to fail first) and 2 blank carts and a plug in charger (no USB or PCC chargers). I noticed that the vape-pen and the revolver batteries were the same size, have the same atomizer connection and have been charging my revolver batteries on the new vape-pen charger. I have not tried the vape-pen yet, as I still need to fully charge the batteries first, but I just want to mention that I think it is possible that the Revolver parts should work with the vape-pen mini. I know they claim to have lowered the temp for herbal vaporizing, and they did send a sample of ginseng juice with the unit for me to test out. I'm just not sure it's a fair deal, getting only one atomizer, no PCC and no replacement parts available on their site for such a large price. I will do more testing with the juice they sent me, and my herbal VG juice and report back with my findings. Once Revolver restocks their atomizers, I plan to order some of those as well, to test out with the parts I have now. I have a nagging feeling these vape-pens are not what they are cracked up to be (no offense to the vape-pen people, I just calls them how I see them) but won't know for sure until I do more testing. For the record, I have been successfully using the regular e-cigs for non-nicotine herbal extracts with satisfying results, I just don't know if vape-pen's claims to be superior are accurate or worth the cost. I will know soon, and will share my findings.