Subaru Impreza 2.0 4WD…who has experiences ??

Hello people, have found at a dealer an interesting offer : Subaru Impreza 2.0 4 WD, Built 03/2000..51.000 traceable km ( all TÜV reports, inspection at Subaru ) with automatic for 500€. My questions : Does anyone have experience with this model ? What should I pay attention to at the check, there are big vulnerabilities ? Would perhaps also be good to know if someone has converted this vehicle to gas and what experiences with it ( brand of the gas system etc ). Thank you in the round… MfG