I would say that it depends on your clientele base and also your financial situation. I too have explored the option of adding on a mobile based service to my business planning. At any rate, I ended up buying 2 used OTC Genisys scantools in the interim. One is updated to 2003 Domestic 2002 Asian Import running 2.0, the other is a year or two behind I believe. What I have come to find is that most people that seek service in the aftermarket are bringing you cars that are several years older. Most that are still covered under the manufacturer warranty will most likely go back to their respective dealer if the MIL came on, so its not likely I would lose any significant part of the business anyway. On the other hand, you can still access the generic OBD2 codes even without having it updated to the most current levels. I bought these machines over two years ago with less than $700 invested for both. I am sure there are even more newer machines out there now if you shopped around. I am not against new, but if you are just starting up, you'll want to keep the costs down and this is one way to do it. The way I figure, when the business starts rolling in, the new ones will still be there.