Does the Waring WFG300 need a special outlet?

Yes. It is a 240-volt unit, so it needs a 240-volt circuit rather than a standard US 120-volt outlet. Check your kitchen or install a dedicated circuit before buying.

What can I cook on it besides paninis?

The flat plates work for eggs, pancakes, flatbreads, quesadillas and toasted sandwiches. Anything you would cook on a flat griddle works, though there are no grill marks.

How big is the cooking surface?

The dual flat surface measures 17 by 9.25 inches. That is enough for several sandwiches or a batch of eggs at once.

Can I control the temperature?

Yes. An adjustable thermostat lets you set the heat for delicate items or a hard sear. There is no timer, so you watch the food yourself.

How do I clean the plates?

The cast-iron plates should be scraped and wiped while warm, and the stainless body wipes down easily. The plates are not removable, so cleaning happens in place.

Is it worth it over a home panini press?

If you make sandwiches in volume or want steady heat and a thermostat, the commercial build is worth it. For occasional toasties, a smaller 120-volt press is simpler.