My EAA Witness in .40S&W never fails to jam. Regardless of the ammunition, it fails to feed.
It's been back to EAA twice, with new this and that... but one thing that isn't new is it still fails to feed.
As for the .45acp, I only know what I have read in an older issue of Gun Tests, and they experienced similar problems.
There are lemons in every manufacturer, but too many of these lemons make their way into EAAs products.
Personally, I would avoid the purchase unless I was allowed to function fire that particular piece I wished to buy.