Not adding anything but opinion and my experience. A lot depends on your work and order of operations. Get a cheap set and keep it around for "just in case" on a once in a lifetime job. Go very slowly and back it off and clean out the hole frequently. If you are cleaning up threads in a bracket and have access to the back side (through hole), chase them with a cheap tap. If it snaps, you can easily get to the nose and back it out or work it through.
Cutting six pocketed 2-56 threads in the box cam of an RG&G Gatling Gun after 10 hours of mill, lathe and bench work; use brand new the best you can buy taps. Quality taps can still break, but not as easily as junk taps. Extracting broken taps is a PITA, especially in a pocketed hole. On the plus side, if you break one off in a part you've already spent 10 hours on, the second time you make the part will probably take less than 10 hours.
I have some junk taps and have used them in brass or aluminum. But once you buy quality, you'll stick with the good stuff.
Bruce