Pros: Accurate. It will get you in tune.
The light up feature when you are in tune is nice.
Cons: It struggles to find what note you are on. Sometimes it will get lucky and pick out the right note the first time. All too often it will flounder on what note you're playing. For example, I might sit on the B string and it will tell me I'm sharp for the A string, then flat for the D string before telling me how to tune for B, without me changing anything for that string at all.
It doesn't have access to the full chromatic scale. It will only tell you if you are on one of the standard tuning notes. It tries to tell you if it's Bass or Guitar tuning, but does a laughable job at figuring that out.
All in all, it is functional, but frustrating to use,