Needed a replacement reaper that had a cover as I have children who love to hover around while I sew.  It does take time to put the cover on/off and yes my children can remove the cover, but by that point I already can prevent them from fulfilling the act, and it prevents any unnecessary stabs.  That being said, this little thing is sharp.  It doesn't need a lot of pressure to cut through the thread.  The handle is also long enough where it is comfortable to use.