There are many people who say this doesn't work/fit with Monoprice's own CAT6 cable, while it was a bit snug on CAT6 it feels really secure! I used a couple of these on CAT5e cables, it fits CAT5e, but it doesn't feel that secure.
TL;DR: -Great value and price for CAT6 -Make sure to get 2 packs per 100 connectors.
I purchased these to go with Monoprice PID 880 (1000FT 24AWG Cat5e 350MHz UTP Solid, Riser Rated (CMR), Bulk Ethernet Bare Copper Cable - Blue) and PID 7245 (RJ-45 MODULAR PLUGS RJ45 - 100 PACK FOR SOLID). They are sort of big when sliding them around the RJ45 end. While they don't feel like they'll just slip off on their own, they're definitely easy to slide off after setting them. I tried gluing them on but that was a disaster so we just ended up leaving them on the ends and hope they don't slip off.
PROS: They feel high in quality
They technically do what they're supposed to do
CONS: Too large for RJ-45 MODULAR PLUGS RJ45 - 100 PACK FOR SOLID