In 1971, Oregon track coach and Nike Co-founder Bill Bowerman used his wife's waffle iron to experiment with the idea of using waffle-ironed rubber to create a new sole for footwear that would grip but be lightweight; hence making easier for individual's to be able to increase their speed. Oregon's Hayward Field, where he worked, was transitioning to an artificial surface and "Bill wanted a sole without spikes that could grip equally well on grass or bark dust." He was talking to his wife about this puzzle over breakfast, when the waffle iron idea came into play.  Bowerman's design inspiration led to the introduction of the so-called "Moon Shoe" in 1972, so named because the waffle tread was said to resemble the footprints left by astronauts on the moon. Further refinement resulted in the "Waffle Trainer" in 1974, which helped fuel the explosive growth of Blue Ribbon Sports/Nike.
It almost goes without saying, but you’ll benefit from a waffle iron with a nonstick surface. Nonstick surfaces significantly reduce the amount of hassle involved with taking waffles out of the waffle iron, helping ensure that waffles come out unbroken. A nonstick surface also reduces the amount of oil or butter that is required to cook the waffle, making them a little healthier than they would otherwise be.
Some of the models we tested come fully loaded with features, while others are more bare-bones. The question is which of these bonus features, if any, are worth having. Almost all the waffle makers come equipped with adjustable heat settings, a feature we found mostly useless, since there’s almost never a situation in which you’d want anything less than maximum heat. It’s a feature that’s even more vexing on the losing low-end models, which, even at their highest settings, were not very hot. (There were some exceptions to this: Our winning flip waffle maker got so hot that we appreciated being able to turn the heat down.)
Finally, be aware that if you're getting so-so results from a waffle maker that usually draws rave reviews, the problem might be your batter instead of the machine. Users who substitute pancake batter for waffle batter quickly find out that there is, indeed, a difference between the two. Pancake batter in a waffle iron generally produces a heavy, dense mess that'll stick to the waffle iron like glue, and users warn that some "waffle recipes" found on the back of pancake mix boxes don't do much better. If you're into creative pancake making, you'll do better cooking them on a stovetop skillet or electric skillet, both of which we cover in separate reports.
That said, quite a few users say that this waffle maker isn't as sturdily built as previous versions of the same model, and that if you don't get the top heating plate aligned just right, it can fall off -- an injury hazard if the plate is hot. The top of the G48TD also gets very hot. Some use pliers to bend the metal clips that hold the heating plates in place, which helps them line up better -- or you can just use an oven mitt to protect your hands.