The PL-300 used an outboard power supply and required an external computer (Win or Mac). While this technology realized the dream of direct stylus interaction with the screen, specification-wise the PL-300 suffered from low resolution (1024 X 768), poor color accuracy (typical for LCD displays of the era), tricky setup, as well as sluggish performance. It would take Wacom several product generations to eliminate these early impediments.
Apple in 2007 debuted the iOS-based iPhone, heralding the dawn of the multi-touch finger-sensitive touchscreen interface that is today ubiquitous on multiple platforms. Following the success of the iPhone, the iPad arrived in 2010 sporting a larger form factor. Both the iPhone and iPad utilize capacitive display technology which enables direct interaction using your fingers. Unfortunately, this technology is not well-suited to precise expressive mark-making. As a result, several 3rd-party stylus solutions solved this limitation by leveraging Bluetooth as a means of sending pressure-sensitive data to the iPad. Due to the capacitive display, however, these styluses suffer from large tips that hinder precision.
Apple addressed this in 2015 with the iPad Pro and its integrated Pencil stylus. Improvements in display, processor, and stylus sensing technologies provide the iPad Pro with an elegant expressive gestural mark-making solution, albeit within the iOS ecosystem.