I can't live without these. I've grown so accustomed to them, whatever would I do if I had give them up? Hopefully they'll be with us as long as there are Macs. At a glance I can see how my RAM is doing, my CPU load, whether or not anything is accessing my Mac on the networks, and whether there is any disk activity going on. Further, by clicking on any meter, I get a full report. They are excellent. Use them.