While there’s a huge variety to Paper Mate’s line of Inkjoy pens, the Inkjoy 550RT is the only one which is “designed for fun.” At least, that’s according to Paper Mate’s marketing department. In reality, however, there’s nothing that’s exactly “fun” about the 550RT, but it still manages to be a decent, disposable ballpoint pen.
Really, the design of the Inkjoy 550RT is nice but also relatively plain. Each end of the barrel is covered with a rubbery grip that narrows towards the pen’s middle, creating a very subtle and relatively comfortable hourglass shape. It has faux-chrome accents, a sturdy clip, and a clicker that’s reliable, though not terribly robust.
The ballpoint ink is surprisingly smooth and smear-free, and it dries darker than what you’d find with a cheaper ballpoint. Although it’s not quite up there with the Pilot Acroball or uni-ball Jetstream, it’s still a worthwhile product if you’re looking to buy a handful of ballpoints for only a few bucks. Only, you should be sure that your expectation for “fun” isn’t set too high.