Also remember on the D200 you need to individually update A firmware separately from B firmware.
I don't recall seeing any issues reported here as long as instructions were followed.
Firmware updates are important. They contain some reported fixes and a number of minor fixes that are not even listed. From a software management standpoint, it makes a lot more sense to sell cameras with one firmware package and have the user apply the latest updates rather than trying to insert firmware changes into the manufacturing and production process.