I have them and they work well. One nice thing is that they are higher than some of my other cable risers, so I can use them to separate (and cross) the power and signal cables more effectively. I had deferred putting my cables up on my collection of risers after the last move in the fall, for several months, only to once again, be shocked at the improvement in sound. It is like picking up the system and moving it from the living room (since most recordings had a similar sound and signature) and moving it to the original venue.
Personally, I found them very inexpensive compared to some of the other risers I use (various models from Shunyata Research), and will probably buy another box of them.