Neiljd55: Has anyone flashed the latest release XXELKC from androidadvice.com. Apparently it is an official stock release and will keep warranties intacked
Using anything other than Kies or OTA updates to update firmware will void your warranty. I have had it confirmed by Samsung that even flashing a stock rom from a different region will void your warranty as Odin is not intended for end user use, it is an engineering tool.
If you're going to claim warranty on a phone, make sure it is running the original rom with matching product code and CSC and make sure the flash counter has been reset (triangle away - use at your own risk). Otherwise you will have a very hard time getting your warranty claim approved.