Snap-on Solus Scan tool
 

Snap-on solus scan tool. I bought mine about a year ago. I have used it alot and it works great. Ive never had a problem with it and it is very easy to use.

Pros- It works on a wide range of cars and you can update every year. User friendly.

Cons- The only thing i can think of is the cost. Its about $3900 new.