I have five or six of them around here. I use whatever I find first and ditch them one at a time as it becomes dull. The reason I have so many is that they tend to run and hide whenever I have a job for them to do. They are smarter than they look! The last time they all ganged up for several days and I was forced to buy a couple more ... Then they came out of hiding and I had six or seven of them in plain sight!
