In addition to the bottom bracket cup tool BBT-22, since Park's being cited as an example, the Park puller model CCP-22 would be appropriate (there's a similar tool but with a larger head for ISIS/Octalink type). When using the crank puller be sure to thread it onto the crank all the way, sometimes you may need a wrench rather than just your fingers depending on the quality of the crank's threads. When using the cup tool sometimes helps to have either gravity help keep the tool in place, or something like a quick release skewer to hold it in place; also sometimes helps to have a longer lever arm, i.e. a longer handled wrench or something to extend your wrench's handle length like a piece of pipe. The cup tool can be used with Octalink/ISIS cups generally, but isn't used on the newer external bearing type cranks. The square taper puller is used only on square taper bb cranks, although you can make it work on an ISIS/Octalink crank with a little help. So whether it's useful to own these tools depends on whether you continue to use cranks that use them...