I have been vaping with a common aspire BVC, no adjustments, no disappointments. With most talk here nowdays, I bought an Avocado and a Theorem. Both are top notch -no leak nice systems. But they are too airy for M/L. I thought they would be something better than the simpleton I have. They also all come with a "drip tip" and a tank. Maybe I should just forget about rebuildables. I don't know. They are just not what I expected them to be.