It depends on what you know.
https://www.youtube.com/watch?v=PSG6C29Q-qc
Filarmonica razors are available in abundance. Just as you said. Great. Good razors in abundance. Hooray.
Next, you may want to do a bit of research. Because you have money to spend. You will find out, very quickly, that those #14 blanks were to razors
exactly what other Herkenrath blades are today (and were back then). Aust, Dovo, Revisor, Wacker - pick one. They are all using the same blanks. But, and therein lies the difference, the grinders are what makes a great razor. Aust? An emphatic yes! Revisor? Same as Aust! Wacker? It very much depends. Dovo? I'd very much prefer my razors to be made by people who eat their own dog food. Thank you very much.
Filarmonica? Same as Dubl Ducks. Export quality. Very decent. Nothing more, nothing less.
"ones of the best shavers money can buy"? Absolutely not. If you can find a #14 Henckels, you will see what Solingen master grinders could do back then. And that is not mentioning #14 Mercator, Guilleromo Hoppe, and others. If you want my personal opinion, Filarmonica razors are easily the worst value for money in the market, and have been for several years.
Thank you very much, but I don't use, let alone buy, cartridge razors paired with floppy Chinese brushes. I have vintage razor stands, and a few Thäter brushes. Less money spent, a lot more value added.