rsracing1

Hi..Been on and off here for a few years spectating and now pulled the trigger on a 2005 E55 one owner 92K with complete service history. I dont have issues at the moment but would like to have one of the Star diagnostic tools on hand to trouble shoot any future issues as they arise or if/when they arise.
Can anyone recommend a system, is there more than one option, and the pros and cons of whats out there?

ideally a used system would be my first choice

Thanks.