I use MotorCheck simply because it does all the checks I used to spend lots of time on, but all at once - and a few more. It benefits me when presenting professional paperwork to a potential customer. The ability to add a photo of the actual car on the motor check print out, previous ownership dates, Last V5 date, even the engine code has come in handy! I like access to the pictures of the damage when I am faced with a write off car. Throw in full MOT history, Road tax band/status and finally a realistic (Mostly) valuation based on Autotrader average makes it a 'no brainer' for me.