After 25 years of sawing everything I threw at it, it died today. Opened it up and the yoke (part 46 on the parts diagram for the newer saws) was cracked and the eccentric had done a bit of pounding on it from the wrong side. It's repairable, I'm sure, if the parts are available--will call Bosch manana and see (they don't have the parts list for that model on their Web site that I can find).
Meanwhile, went down to Home Despot (would happen in the middle of something that I had to get finished on a Sunday when Coastal isn't open) and got the latest and greatest 1590. Not a lot of difference in feel between the two but an awful lot of detail improvements.
The new one has everything that I've wished the old one had and a few things besides--the tilting shoe (the old one is fixed in position), the trigger on/off/speed control (the old one had an on-off switch on one side and speed control on the other--not the most convenient arrangement--the new one has a conventional variable-speed trigger with a dial that sets the maximum speed), and the dust blower (pain the butt following a line with the old one). I never really had a problem with the blade change on the old one, but still it's nice to not have to keep track of that blasted special screwdriver anymore. The blade on the old one was well controlled, if the "precision blade control" improves on that the cut quality in wood has to be awe-inspiring (the cut quality in wood was _already_ awe-inspiring when compared with the non-Bosch saws that were available 30 years ago).
All around I'm annoyed that the old one is dead, but I'd been hankering for the features of the newer ones for years. If I can get the parts I'll probably end up fixing the old one--not sure what I'll do with it afterwards.