A fully charged hit had me enjoying just a few puffs of concentrate at a time due to the impact of it's ability to fully vaporize concentrate. It compares to heating up a nail to near red hot with a torch. Much more than the less expensive pen I had which was maybe half the milliamp-hour. Would definitely recommend as a an upgrade or an entry level, it is worth the investment.
The downside is that the included mini box mood has a small, approx 1/16" opening that tapers down further to maybe 1/32". I only had a non metric ruler. Other than that great buy.