For over 6 months now we have had two serious problems with our FWSMs. One was recently cleared with a slightly nervewracking OS upgrade (we're really not wild about versions that end in 0) but the other is not fixed. You'll notice I am being deliberately light on detail here. We do have open cases with Cisco but they are finding it difficult to diagnose the problem.
If there is anyone else out there who will a) admit to having FWSMs (they seem to be fairly rare) and b) will admit to having any problems with them then I'd be very happy to compare notes.
Thanks,
Sam Wilson Network Team, IT Infrastructure Information Services, The University of Edinburgh Edinburgh, Scotland, UK