This will be long but it details my experience with my Razer mouse and keyboard. There is a video at the bottom simply for reference (so you know what the hell I'm talking about.)
I have been using the Razer's Black Widow 2012 Ultimate keyboard and their Mamba 2012 Mouse for quite a while now and I think if I could go back I wouldn't choose Razer period. Razer products initially struck me as high quality, well built, high tech and altogether the best of the best but to my dismay I found that the Razer products are failing my expectations in several areas.
First let's talk about the mouse, my least favorite Razer product. The first thing that I noticed was that the rubber lay-in where my thumb rests wants to come out. The corners keep popping out and I need to push them in with my thumb as I game. Minor irritance, but nonetheless not what I had expected from a seemingly prestigous company. Over time the next thing that started to bother me was the software which seemed a bit unstable (Note: this is not synapse 2.0 software.) It still got the job done, but the way it did so wasn't pleasing. Both of those things are very bearable, but as I said before not what I expected when I paid the price I did for this mouse. Lately, though, this mouse has been having issues that have driven me to write a rant about it here on the forums. The mouse has been moving without my touching it almost constantly lately. As I watch Youtube or whatever the timeline will pop up as if I moved it, which I have not. Just to see how much it moves I went into paint and held the left click to draw something and sure enough it hovers about without my hand moving at all. This became especially irritating when I try and play games, BF3 is near impossible when my mouse hovers everywhere but where I want it to. Worse yet, about a week ago the mouse went awal and was clicking and hovering (this time halfway across the screen) by itself and I had to power off my system to make it stop. Upon reboot the mouse was back to normal for about an hour, then the hovering started once more. I found that unplugging the mouse stops the hovering for about 10 mins. I have reinstalled firmwares and drivers several times with no success. The last thing about this mouse which is very very irritating is that sometime either the x or the y axis control will be lost and the mouse with go either vertically (up and down, not just straight up) or horizontally depending on which axis control is lost. This problem has happened to me about 6 times or so, probably the least frequent problem I have. I take perfect care of my mouse and my desk isn't cluttered. This mouse isn't banged around nor is it traveled with. It's too late for me to get a new one, but it's not too late for me to warn people about this mouse. I don't know how the 2013 model is, but stay away from the 2012.
Onto the keyboard, which I have much less to complain about. My main complaint with the Black Widow Ultimate 2012 is the backlighting. On the first model I bought my Insert key's backlight would flicker between a low dim and the set brightness at random times. I returned it because of this and about a year later I see that my End key is doing the same exact thing on the new model. There is a bigger problem with this keyboard which is difficult to describe, so I made a video which you can find at the link below.
http://www.youtube.com/watch?v=KoW4YJqDEEY&feature=youtu.be
If anyone else is having these issues, similar, or have other stories about their experiences with these products please leave a message so the world can know!