If speaking just the mouse, I own DeathAdder and Mamba.
DeathAdder was a great mouse, and when I got Mamba, it was even better.
I personally think Razer is worth the money, HOWEVER that is only if you are really certain you want that item. If you're on a budget and there is a different cheaper choice, then definitely go for that one. If you have the freedom to spend a little more, then get the Razer.
I have not faced any problems regarding Razer products. I have owned or own 5 products from Razer, all working fine.
Though, if one of the peripheral breaks I would probably switch over to a different cheaper choice, but that is just because I am currently saving up for something.