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Despite its customizable hardware, the Rat 9 won't fit everyone. ... Still, aside from the occasional nitpick, we couldn't find a thing wrong with this sleek transforming mouse. That's not something we get to say often.

The Mad Catz Cyborg R.A.T. 9 is the most expensive gaming mouse we know of, but its vast customizability, unique features, and strong performance make it a worthwhile expense for demanding PC gamers.

The Mad Catz R.A.T. line is impressive, and very desirable if you can never seem to find a mouse that works well with your hands, or you just love to be able to tweak and adjust your gear.

A striking and powerful, but heavy and inconvenient, gaming mouse. Definitely unique, though.

The wired version is pricey enough and you really don't get enough on top of that version to justify the extra £50 price premium MadCatz is putting on this wireless mouse.

The design of the mouse is a breath of fresh air and its performance is top notch, not to mention the crap ton of features it packs in. We can’t find much to complain about the R.A.T. 9 other than the fact that it costs a whopping $140 and ... it won’t necessarily be perfect for everyone.

The Cyborg R.A.T. offers wireless functionality with no noticeable impact to gaming or general use when compared to a wired model, it performs exceptionally well. Additionally a high level of build quality is backed up by a hugely flexible design and easy to use software suite.

What you're paying for is the convenience of wireless operation, the exceptional build quality, and the physical configurability of the mouse itself. ... Is the most expensive consumer mouse worth it? If you're a serious gamer, the answer could be "Yes."