I have used an Auto Enginuity (AE) with ProLine connector for years now and is an amazing tool, Professional grade. I was turned on to this unit via the Ford forums I was frequenting as I needed something to look at my 1999 7.3. You can buy the software for various manufacturers. I have Toyota and Ford but can only use it on vehicles 2010 and earlier, if I want to work on newer models I would have to pay $50.00 for an upgrade... Anyhow, I have been very happy with tool and service..