Objectively the G7 sensor is a bit rubbish, but all the laser mice sensors are. As laser mice goes its OK but laser mice in general aren't all that accurate. Its also a wireless mouse so its heavy and has more latency.
Of the historically mice I was really upset when my G7 started messing about, I actually played really well with it and really liked it. But knowing what I do now about mice and how they are meant to function it wasn't very good. Depends on what you are looking for.