Buy every style you can find. There are situations in which each is handy, I use the Buttner style most, but I have the Pip-Net set for estates that are in dire need, I also use the Senior reamer quite a bit and the Dunhill adjustable spoon is useful for certain chamber shapes. The more the merrier, you won't ever regret having extra tools at your disposal. BTW, these are only necessary when I'm cleaning estate finds, as my pipes do not require reaming because I do not let my pipes accumulate any cake. I let the inside of the chamber carbonize and that's it, I do not think a properly made pipe needs a cake to smoke properly.