Called Dobsonians, these telescopes give you the maximum aperture at the lowest price. Unfortunately, reflectors aren't perfect. Their design requires a secondary mirror to be mounted on support struts in the light path 'at the top end of the tube. The incoming light is forced to diffract around the struts, which makes individual stars appear to have spikes radiating from them. It bothers some people, but most get used to it.
Reflectors also exhibit a defect called coma.
Coma is minimal in the center of the viewing field, but it can be annoying in a wide field, when looking at an extensive star cluster or nebula. The bigger the aperture, the heavier the tube and the more massive the mount. Fortunately, a lot of the new models assemble quickly, but you still have to get the instrument to the site. Sometimes it seems that the entire telescope industry is oriented toward the Schmidt-Cassegrain market. A great deal of the astronomy gewgaws and techno toys developed today are aimed specifically at users of Schmidt-Cassegrains.