Just a cheap Matco one, just really keep it in my truck so I can monitor engine data on the road. Just read codes, stores freeze frame data and has live data. Think it was on sale for 150 bucks so I picked one up. No need to have an expensive one when we have 2 Tech2'* at work, I have Tech2Win on my laptop (Tech 2 software on PC and communicate wireless with the MDI). And all the new GlobalA cars use GDS 2 which is also done with the laptop.
I would like to get more snap on stuff but the snap on dealer is pretty hard to rely on. Only comes by the shop about once a month unless someone owes him a fair amount of money. Matco guy is there 10am every Friday.