Hello there, welcome to the forums
Let me tell you that there's no hardware/software in the world that everybody
is going to like, you'll see some perfect and awesome reviews, but then you'll see some ugly reviews. That's completely normal because two separate individuals react different, even in the same situation. It's called Consumer's Behaviour
You should also know that manufacturing process is not perfect, which means that there's a chance that somebody got a defective piece of equipment. it's a real world. things happen.
Here's the Arc mouse in Newegg. check its reviews. from what i've heard/read, it's a great mouse, comfortable and great overall. Newegg.com - Microsoft Arc Mouse - Black