The Razer mouse bungee does exactly what it advertises, and it does it very well. Simply put, it holds your mouse cable up in the air so it doesn't get in the way while you're moving your mouse. This means you'll feel less resistance, and your movements will be much more consistent; thus helping your muscle memory and accuracy. This improves your accuracy and speed in the long run, even if you aren't a gamer. There's also the added benefit that this thing could help you save some desk space, but that depends on your creativity.
Now that we've got that out of the way, let me explain why I gave this thing 3 stars after saying such good things about this product.
The base of the product is a lot lighter than what I expected. There's the possibility that the mouse bungee could get moved around; this means it could get knocked over. To counteract this, the rubber feet are actually covered with a layer of adhesive. The adhesive works well. It sticks well without leaving the surface messy. It can be washed with water, but doing that too much will definitely wear it out quicker than just leaving it in one place for a very long time (so do be careful). So because they opted to go for the cheap adhesive route, I had to give this 3 stars, especially considering the fact that you're dropping 30 bucks on this thing. Had they but made the base a lot heavier than it currently is, I would've given it 5 stars, but for the price, it just doesn't seem fair in my opinion.
If you can get over this one big flaw, it's still worth getting. I'm very happy with mine, I haven't moved my mouse bungee at all since day 1, and even if the adhesive wears out someday, I can always apply a new layer in the future.