We rather liked the original, and as the name suggests the Kone[+] is more of the same but refined.
While the original came with 5, 10, 15 and 20g weights, each weight had a chip inside it purely so the software knew which was inserted. The [+] takes the more sensible (and no doubt cheaper) route of simply offering four 5g weights, with the user being able to adjust the weight to their desire. It still doesn't offer the same level of customisation as Logitech's G500, and is a lot more fiddly as you have to twist the manhole-cover-style lid on the bottom off to get the weights in, a tricky affair when you still have the mouse plugged in, as pressing buttons accidentally is sure to happen.
Layout is similar but not identical to the original Kone, with Roccat producing a mouse that feels like a tighter offering.
Buttons under and above the scroll wheel have changed from round to square, with significantly more surface area made available to make striking easier. The button above the scroll wheel is by default set to the Windows key, which is quite awkward to press due to the pressure required to activate, and having to wrap your finger over the wheel in the first place. The buttons underneath are on-the-fly DPI switchers, which, while easy enough to use, aren't as easy as the Logitech G500's, as it places them within easy reach on the left mouse button.
The scroll wheel itself is four-way, and the usual back, forward, left and right mouse buttons are here too, although all of these can be customised through Roccat's software. That and the back button don't work as such by default, but rather as a shift: hold it down, and every other button on the mouse now acts as something else, almost doubling the amount of buttons you have in one shot.
The shift button gives you more flexibility, creating almost twice the buttons in a single press. (Screenshot by CBS Interactive)
Making a return effort are the light strips down the side, with 33 colours to chose from and four different customisable zones. Five effects are usable: fully lighted, blinking, heartbeat, all lights off and breathing, with the speed for these effects settable as well.
There's also a colour flow effect, which seems to cycle through all colours regardless of what you set, in a user chosen direction of either up, down, left, right or, if you just want things to sit still, off.
Glowing bits tend to be a staple of gaming equipment. (Screenshot by CBS Interactive)