I'm using Logitech g100s which is being advertised as the "RTS mouse" of the new Logitech gaming mouse series. It may be better for RTS's but hey, it might just be marketing.
I was on a budget so this is the cheapest one in the series, but I really love it. I like its simple ergonomics and design, which is pretty much the same as those "classic" mice from the 90's
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So its old school but with better material and technology of course. Simple mouse but does its job very well.