Summary: Keep in mind I use this to play competitive games - I'm in no way "professional" skill level so why would I need a "professional" mouse. This will do the trick and do it well for you.
Pros: Ergonomic Durable (Both of my kids have at various times slammed it down on the table and desks) Long Life Long Battery Life (Purchased November of 2013 - Replaced the batteries three times) Decent weight without a dedicated weight feature.
Cons: None really. If I ever have to buy a new mouse (I'm sure I will at some point - nothing last forever) I'll probably just get this one or another Logitech if there's an updated model.