Wkae me when they can lift at least 1 kilogram at least 1 meter with a sustained acceleration of at least 1 meter per second per second greater than gravity. Hell, if they can just reduce the effect of gravity so that reaction drives get more efficient, that’ll do; once in orbit even a little acceleration would be very useful.
Frankly, though, I suspect that it won’t work. Ever.
"In 2001, British Electrical Engineer Roger
Shawyer first introduced the “impossible
drive,” known as the EmDrive. It was called
“impossible” because its creator purported
that the drive was reactionless, meaning no
propellant required—in other words, it
defied the known laws of physics
(specifically, the conservation of
momentum)."