These bands do exactly what they are supposed to do. They can be easily adjusted, yet they don't fall apart when tightened.
Although they are rather cheap for a pack of 10, there are some pros and also cons:
+ Cheap
+ Small
+ Pack of 10
+ Holds the cables well, without loosening
- The sides are starting to become frayed if bands are adjusted often*
- Too finicky to be used "correctly"**
Despite this, I keep a pack in my rack at all times, in times of need.
* Used these for less than two months, and through regular use (2-3 times per week, max), these bands have started to become frayed on their sides. They still hold up very good, though.
** To be tied in the way specified in the on-site graphic. Tip: Tie them the way the photo shows and not the way the graphic shows.