Actors have a saying "The play's the thing", ie: the play comes before the ego. Similarly scientist's should say: "The data's the thing". History and common sense back up the importance of data. Scientific progress has never involved playing it safe and fudging 96% of the cosmos with invisible dark stuff to preserve egos or the status quo. Progress has always come from looking at controversial new data, and thinking anew.
Quantised inertia is the result of pondering new data from the cosmic scale to the atomic, and I have had empirical success at various scales (cosmic scale, galactic scale and Solar system scale), but the lab scale is particularly useful because a desktop experiment can be easily controlled and reproduced. This is why the emdrive has caused such a furore: it is forcing people (well, some!) to question familiar physics for the first time in nearly a century. Not bad for a little copper cone. I do not discount the possibility it might still be wrong, but those who claim it is wrong have to say what it otherwise is, and not just say "it's wrong" as if they have God's phone number.
In all this it is important to keep focused on the data so here is a table of all the emdrive results so far. We have to be cautious because some of these results have been published with varying degree of peer-review (shown in bold) and some have not. I have also included a new result from 'monomorphic' on the NSF forum, so there are now 11 data points, seven of them published in conferences and one (NASA2016) in a mainstream journal.
The table gives a identifier for the experiment on the left in chronological order from top-bottom. The second column shows the thrust observed in milli-Newtons (mN). The third column shows the thrust predicted by quantised inertia (MiHsC) including the effect of dielectrics (which reduce the speed of light in the cavity). I submitted a paper on this dielectric version of quantised inertia to EPL about a month ago so I should have the reviewers' comments soon. The new 11th data point from monomorphic is shown at the bottom. His power input was 1 Watt, his Q value was 8100 and his cavity had no dielectric and was 0.24m long, and had wide and small end of diameter 0.299m and 0.178m respectively (according to his NSF posts, please correct me if I am wrong). The thrust he measured was 13 microN and quantised inertia predicts 14 microN.
Given all the data surely you have to agree that quantised inertia predicts pretty well for a theory that can not be adjusted and is still an approximation. It ideally needs a computer model, like COMSOL, to do it justice, because my usual technique of scribbling maths on bits of paper is unable to capture em-modes and their complex interaction with horizons.
It would be useful to compare the predictability of quantised inertia with that of the other emdrive theories by looking at some ratio of how accurately they predict the data, over the number of arbitrary parameters they need to do it, but I have not seen any comparison plots showing observations and calculations from the other theories (I may have missed them). If the Plymouth-Emdrive workshop gets off the ground, I will make sure it is empirical. Ernest Hemingway once said: "If a writer stops observing, then they are finished". I think the same thing goes for physicists.