I already have, 3 times.
We instituted a new rule in the store partly because of him and a couple of his friends. If it doesn't stop he will not be allowed to come back, I really hate to see it come to that, but enough is enough.
I'm no saint myself, tonight I actually fielded two crisis suits with target arrays (granting me +1 BS) instead of twin linked burst cannon's. This didn't amount to much difference anyway, in fact the target arrays would have helped me a lot more than the twin link would, but my point cost would have been nearly the same either way (in fact it would have been quite a bit less with twin linked burst).
There are quite a few more discrepancies here too numerous to mention, most of them I can pass over as mere oversights, because they seemed like honest mistakes. You can only push someone so far though =\.
In every fight I have managed to either still beat him outright OR come to a draw, but I would still like to see what a necron army can really do. Or maybe I don't =D.