First, the good: These cable covers are simple to mount and function well. They are easy to open with a screw driver or even a pen, and they are even easier to snap shut. They aren't the roomiest, so you should know that in advance. I was able to run an ethernet cable, a coax RF cable, and two speaker wires without much of an issue. However, it was pretty packed and doubt it would hold more. The adhesive is quite strong, so you won't need to worry much about how hard you tug on the covers while tucking away your wires. The adhesive also brings me to...
The bad: I'm willing to admit that I didn't fully read the instructions that came with the product, so my problems may have been addressed and warned against. However, upon removal, these things are a nightmare. Trying to pull them off would almost always tear the paint and upper layer of drywall right off. When it did manage to come off without a chunk of the wall, it left a sticky residue that was incredibly difficult to clean (I tried warm soapy water, and even Goo Gone). In the end, I used a utility knife to score the edges, and then just ripped off strips of drywall. Then I had to patch each channel, sand, and paint. If I had known I would be moving only 6 months after installation, I would have never used these cable covers.
In the end, I have to give their function more weight than their difficult removal. They work great, and they install super easily. If you are not planning on removing them in any short manner of time, I would recommend them. However, if you are a renter or know you will move in a year or less, you may want to find another product.