I have 2 of the claymores and they are awesome. Best used inside or on a small field (kinda sucks to be far when they blow up
).
Only drawback : when you carry them loaded they can "blow up" (open) in your bag. I now have a piece of tape/cloth or a rope around them to keep them shut while I run and crawl around.
Claymore can be used with a remote, tripwire or you can just put it between two hard surface and it blows up when it's freed (I once put it under a big suitcase that was an objective. When the other team picked it up it killed the 2 players).