So far I have tried 2 different pen types, the newer disposable Blood Orange 2g amanita muscaria and the 1g disposable starter pack (older model with micro USB charging port) and have loved the feeling from a good 6-10 puffs. The only issue I have had is the oil pulling through the cart without vaporizing, resulting in a lot of loss. I would estimate I've lost a good 15-20% of each cart to this, and it makes pulling a bit of a chore later in the pen's life. I was hoping to get reusable batteries with carts, but they were not available at the time of purchase. Hopefully the new carts that go with the Titan have a better design, but I would not recommend the disposable models to anyone that doesn't go through a cart in less than a week.