My only complaint is they come in a pack of 5, instead of 7 for those who choose to put them on all sides. Maybe add the option to buy singles? Other than that, can not say anything bad about them. They cut fairly easy, though I recommend cut slightly longer and shave them down to fit. I did get them to go under my foregrip on the front and rear, so there is no uncomfortable gap. They give great grip texture without being painful, and give the KMR-A rail I have a nice round feeling that feels better than the octagonal feel without them.
Maybe BCM can make a tool next to get under them to take them off. The tool I found, ERGO pic tool had a too thick wedge to get under, but a Lego brick splitter does work.