A vaporizer should have a smooth learning curve. It shouldn't have 20 different buttons, 15 of which are almost never intentionally pressed. Simplicity is the key, and simplicity is achieved by creating an intuitive product that even beginners can quickly understand. Most portable vaporizers actually use convection in addition to a quick-action driving system.
That said, there are some vaporizers that only use convection. They take a while to start, but they provide the cleanest steam of all the vaporizers you can find. Chief among them, the Volcano Hybrid is one of the most powerful and reliable desktop vaporizers in existence. You can adjust the temperature between 40 and 230 °C (104 to 446 °F), it plugs into the wall and you can fill the chamber to 6.5 cm³ so that the good times continue to pass as long as you want.
Ultimately, the portability of your vaporizer will depend on your lifestyle. While portable models are very practical, they tend to require longer preparation times. Portable vaporizers are ideal for traveling or going to work, while desktop vaporizers are best left at home, as some require a wall outlet. Some are even disguised to look like other types of items, making it perfect for those looking for a simple, portable vaporizer design.