Waste of time, do it only if you want to work there, almost 7 or so interviews in total (including the first one in HR on the phone) was not a difficult interview but if your answer is not in the format they want or agrees that their ego wants to hear unfortunately you are not for them, in general most (not all) will be rude and interrupt you in the middle of answering and skipping to another question if you are not answering as they want (even if the answer is right) so at the end you still waste your time to prepare a presentation (slide) and disappear without answering anything funny that at the time of calls and to schedule the interviews everything is fast.