I ordered this before doing any research on vaping, otherwise I would have gone with something else. The unit as a whole works great. Lot's of vapor, long battery life, it seems like it's really good quality. Now here comes the big but; the USA Blend tastes like what I imagine you would get if you made a leather and shoe polish smoothie with a dash of old person cologne. It does not taste like tobacco at all. Now if anyone has any info on compatibility with this unit I may keep it, because I'm definitely not buying any more of their crap cartomizers. However, from what I've read, Crown7's equipment is proprietary. It's sad that it's such a nice product. Luckily they have a 30 day money back guarantee. In any case, I think I'm going to go with a 510 kit from HappySmokes.com.