Apple Mechanical Engineer interview questions

Interview went really well. Spent a long time talking about engineering philosophy with a product manager, as well as answering a couple of technical question. I did a really good job as far as I could tell. Apple HR wrote back and told me they were impressed, asking for information to schedule a followup interview. Apple HR then strung me along for 6 months before I gave up on them. Whenever I wrote back they would say "yeah, we're interested, let me go talk to some managers." I really didn't appreciate it. So yea, the interview itself was awesome and professional. HR - not so much.