I was genuinely very impressed with the interview process for a Product Manager position (at the manager level). I applied through a referral but honestly it took several months & many applications to proceed to an interview. After the mini case, I heard back later the same day. For the power day, I heard back a few business days later. HR will give you packets to prepare for the case interviews, and these documents are very helpful.
1st round: 30 min HR screening
2nd round: 1 hour mini product case
Power day: 4 back to back 1 hour interviews
One interview is a deep dive on a project you've led, make sure you talk about your role through the 'HBTIL' product framework you're given in the preparation packet. Next is a 'Product Design' question where you are shown customer reviews and then work with the interviewer to come up with solutions that would solve those issues (the company is very serious about working backward from the customer).
Two out of the 4 are consulting style/business case interviews, though if you're familiar with MBB cases, they are not as complex and they are interviewer-led, so you don't need to 'take charge' of the case and move it forward. They are really checking that you can do basic math and have general business sense (calculating profit, percentages, variable + fixed costs). For me, the second of the two was definitely more complex & involved customer segmentations & pricing models. I didn't get it all right, I asked for help during the interview and was guided forward through a tough section. I finished well by correctly solving a weighted average calculation, which seems about the most complex thing you could be asked. Brush up on these skills! Very important to talk through your thinking process, do not shut down because you don't know the immediate answer. Let them help you.
Team matching process was probably the most frustrating as that took almost 3 weeks, so the whole process until signing took 6-7 weeks.