RetroSix's replacement parts for the Sega Game Gear include shells, buttons, and membranes1. The shell, made from ABS plastic, includes the front and back shell, port covers, battery covers, screws, metal springs, and a metal cartridge guard1. The buttons are also ABS plastic1. The D-pad was redesigned for improved tactile response1. The membranes are made from new molds for better responsiveness1.
Some users have found the quality of RetroSix products disappointing45. One user on Reddit said that they would rather buy a broken Game Gear for parts than buy anything from RetroSix4. Another user was disappointed in the feel and finish of a RetroSix SP prestige shell5.
However, a reviewer of RetroSix's products noted the glass lens makes the underlying screen look much better1. The reviewer also found the ABS plastic to be of good quality and the inclusion of a replacement battery contact cover to be a welcome addition1.
Ultimately, whether a repaired Prestige Edition Game Gear console from RetroSix is worth £298.80 is subjective and depends on individual priorities.