They are boring. I needed something small enough to fit in a dangerous place and they did the job for it. Unfortunately they are not as effective as they could be. Although I like the neat little blocking feature.
Pros
Suitable for various cables: Compact size for access in small areas. Easy to cut memory wire, rivets, eyelets, small chains, tiger tails, cords, beads, thin wire, etc. If you see or smell oil on the tool, this is normal. A small amount of oil can improve tool running and protect tools.