I've never tried the 1,7 (because it's never available). but the 1,6 is really good. My go-to is 1,6 + Borneo red nano. I mix approx 3 parts premium (for energy and wider spectrum) and 1 part Borneo red (for nerves). Total of 6-7g per dose, twice a day, sometimes thrice if needed. Edit Bigtrea is always consistent too, or so they say. Which is my experience so far.