I think it is a great idea to create a database of experiences. That will give everyone a sense of what worked and what didn't when updating the firmware. It may even help Samsung debug.
I took your questions and created a web form where this information can be entered and an online spreadsheet where the results can be viewed (it gets updated every 5 minutes). I took the liberty of adding funkyp56's response as well as mine.
Results spreadsheet: http://spreadsheets.google.com/pub?key=tstwoLNx0I44jAsuiz-46gw&output=html
Please fill out the form with your experiences, especially those of you that have bricked systems. This might be an added burden, it may help others as well as you when you receive back a working system.
Please reply to this post if anything should be edited or more questions added.