I love how my G600 because it fits my hand very well and it's weight. I don't need so many buttons or any but the size and weight is great. Reason I am wanting to replace it is that it has developed the double click issue. I guess a lot of Logitechs are prone to that. To be fair I have had it for a few years. Still in great shape minus double clicking constantly on a single click. Anyone know of any products I might look at that would be comparable in it's size and the weight?