The AIO Robotics Premium printing pen is marketed by AIO, but it's actually manufactured and conspicuously branded by MKOEM, a Chinese manufacturer of 3D printing pens. (The name MKOEM is an acronym, presumably transliterated from Chinese, for Ningbo Mike Plastic Products Co., Ltd.) MKOEM makes all the parts at its lab in Ningbo, China, though this seems to be the only product that they make there. (One assumes they have larger plans for the future.) As such, it's not hard to figure that a lot of work and attention went into making this single, attractive 3D printing pen constructed entirely from metal, as opposed to the cheap, shiny plastic used for the vast majority of 3D printing pens. It's a good-looking pen, with a matte black finish and a highly readable OLED display showing the temperature, speed and type of plastic it uses. (That last one is a bit redundant, because the version marketed by AIO only uses PLA filaments.)
But how well does it work? Amazon reviewers are ecstatic about it, with 86 percent of owners giving it a five-star rating, at least as of this writing. Like all 3D printing pens, the Premium has a hot tip (which seems have a range of temperatures from about 180 to 195 degrees Fahrenheit) that melts the plastic filament as it passes into the outside world, where it cools down rapidly into a solid shape, either on a surface or extending from a surface into midair. There are buttons for controlling the speed and temperature of the extrusion, and for loading and unloading the filament. It's reported a noticeably heavier pen than the standard plastic kind, so you might expect some hand fatigue in the middle of creating a geodesic dome, but you can always model in smaller pieces on a solid surface, then attach the pieces together in midair with small dabs of filament.
The price of a new model is in the high range for this kind of device but hardly exorbitant. For other, more plastic, examples of 3D pens, take a look at the Knox 3D Printing Pen, the Dewang DW-X4 and the Future Make Polyes Q1.
I was super impressed with not only the packaging but the overall style, weight and ease of this pen. Overall I am very satisfied and impressed with this little pen...
Worked with every type of PLA I had around me, was very quick to heat up, and held to a very consistent speed. Would highly recommend this pen.