Razer hardware is pretty good, but the death adder definitely has a shelf life. The scroll wheel goes soft and the click switches go bad but that's fixable.

The software is hot steaming dogshit. No other description fits. It'll work fine for a few months or a year but then it starts crashing regularly for no reason. I tried a firmware update on my black widow 2012 and it bricked it. While searching for help, I discovered it was A KNOWN ISSUE THAT HADN'T BEEN FIXED IN 2 YEARS. They jerked me around about the warranty and I raised enough hell that they RMAd it with a newer black widow. I bought the 2012 edition purposely because it was blue and the new one was green so I was miffed about that, but it's held up and is still my current emergency backup keyboard. It can deal with generic drivers though. Synapse will never touch my pc while I'm alive and I'm never giving razer another cent.