I have had a EdgePro (bought used, sold for more than I paid), Sharpmaker (bought used, still have), Harbor Freight 1x30 (still have but I read too much about ruining the temper of the micro-edge, so I went back to the Sharpmaker), a Norton India stone with coarse and fine sides.
You can't go wrong with the Sharpmaker, but you will need to learn the trick of clipping course sandpaper to the stones to do your reprofiling. The 'course' stones are very slow and if the factory edge is more obtuse than the Sharpmaker preset angle, you'll be frustrated that you are making stroke after stroke and just taking metal off the shoulder. (When the factory edge is less than the Sharpmaker preset angle, it works rather quickly.
I recently added the super fine stone.
If you don't like it, they hold their value and you can probably sell it here for a decent price without losing much. Even better if you find a used one.
I think everyone needs an India stone for axes, Scandi's and other tools.