I've had my Dog now for two days. I also own a Volcano and a Pax. Honestly, the Underdog is my favorite of the three. The Volcano and the Pax are both quality vapes, but for me, they both have their shortcomings. Neither vape can be left on 24/7. Also, the Pax and the Volcano are not very conservative with your herb
The Volcano is bulky... bags and spare parts must be purchased regularly. The Pax has a very restricted air flow and a few minor bugs to work out. That's to be expected with a new vape.
The Underdog is VERY conservative with your herb
It works well with a large OR a small amount. The air flow is excellent, making for an easy draw and NO learning curve. There's practically no maintenance, plenty of spare parts are included, and it's small enough to travel. The Underdog is very stealthy and a beautifully hand made work of art which can be left on 24/7 so it's always ready. If you are new to vaping, this is the one for you. You will be producing DENSE clouds with no effort
On top of all this, you get friendly, lightning-fast service and shipping. What more could you ask for