35 µN? That ain’t a lot of cookies....................
But I have a lot of doubts about it myself. We see too many of these too-good-to-be-true scams.
But... IF it's real... OH, BOY!
That depends, actually -- space is funny that way. We used to model continuous thrust forces of 0.05 lb for the Shuttle (which weighs 225,000 lb). That's a tiny acceleration, but very noticeable over the course of an orbit.
If you can keep even this small thruster firing for long periods of time, it adds up to a lot. Of course, it really all boils down to power: how much does it take to get this mouse-fart thrust?