In my experience, the Turntable Basic protractor is fatally flawed in that it does not permit the user to precisely locate and align the spindle with the pivot point of the tonearm. You've got to aim it by eye at the pivot, which is usually several inches beyond the edge of the protractor surface. Yes, it can be modified by the user to allow for closer approximation, but that's still a big problem with the original design. And to say it will "work" for any cartridge and tonearm is really to say it will approximately work, because there are minute differences for which it cannot account. Take a look at the UNItractor or the SMARTractor from Acoustic Sounds, and you will appreciate what those tiny tonearm to tonearm variables might be. Or even the Feickert. This is why Mint protractors are made one by one for each tonearm.Sure, a SMARTractor costing $600 will make HTA a bit easier to set than the $20 turntablebasiscs device. But if you simply mount the turntablebasics on a piece of card stock and extend the line to just about touch the base of your tonearm, you will have achieved what the SMARTractor does. If you think these sort of devices (whose geometry is fundamentally the same) cannot be absolutely as accurate as an arc protractor made for a specific arm, you don't understand the geometry of these devices.
Audiophile insecurity and smart promotion drives many hobbyists to the most expensive devices when the simple one will do the job.
Hey, it's your money. Spend it as you wish.