I have not been on the board long, but when I bought my first boxster the IMS paranoia drove me to read a lot on the question. The result of all that reading was that I am no longer paranoid and I don't feel it is necessary to immediately tear my cars apart to replace the IMSB. The clutch on my Blue Boxster feels tired so I am seriously considering doing the clutch and IMSB on it this winter while I am getting the maintenance up to date.
I was impressed by the videos made by Ben Burner on the IMS. He sourced the bearing and other parts himself, built his own tools and did a whole series of videos that go from the choice of bearing, tear-down and reassembly and cost breakdown. I like the way he approached the problem and will probably follow his example. This video explains his choice of bearing:
https://www.youtube.com/watch?v=IxdvSq_byZw
Now just give me a minute to hide behind a brick wall...