I have a Reviol low F that I love. It has a nice, chiffy sound to it. Lovely!
I have a Grinter low F (wood) that’s charming in sound. Rich and reedy.
I also love the sound of F Low Whistles and was thinking about getting a new one; it seems Reviols are quite nice (though I haven’t heard any sample) but now I’m really confused 
I own a Large bore Low F Susato; it is great but way too loud for me
Is there anyone who have tried the Low F medium bore? I have an Susato in A (M Series) and an F body would be a good choice (if medium bore are quieter)
Speaking of Medium bore Susato Low F whistles…
I just got mine today! I couldn’t be happier with it! While the size does take some getting used to, I expected that. The tone is great, with a reasonable amount of breath in the tone. I had heard that Susatos sounded like recorders, but this Low F sounds so whistle-y. I love it!
I have an Alba low F and love it. I suspect that someone here will like every low F made.
Ron