A number of urban legends exaggerate the size and speed of the solifuges, and their potential danger to humans, all of which are negligible. It is their fast movements and their unfamiliar spider-like appearance are what scare people the most. However, if someone was to aggravate, provoke, or frighten a solifuge into attacking, the bite would indeed be very painful, considering the size and strength of the chelicerae, as they can shear off hair or feathers off of prey or carrion and cut through the bones of small birds, but they never need any medical attention other than the ones for a flesh wound.
There are a few things to remember about these frightening creatures. Solifuges cannot produce venom, thus rendering them a non-venomous type of species. Also, solifuges are not prone to attack humans. They aren't especially large, the largest having a leg span of 12 cm. However, they are the fastest of the arachnids, with an estimated top speed of 10 mph, so most people can outrun them if they have to.