Samsung Vibrant update available on Kies, but T-Mobile says don't install it

While getting everything ready to write up the obligatory How To manually update your Samsung Vibrant post, we stumbled across the above.  We're not exactly sure what these known issues may be, but T-Mobile is warning users NOT to do the manual update through the Samsung Kies program, but to patiently wait for the OTA. 

If you haven't already updated, don't.  Carriers don't have to help those who jumped the gun, so it's better to be safe without a GPS fix than to be sorry with a bad update that makes things worse.  If you have already updated, hopefully T-Mobile can get you back on track, or maybe the unofficial Vibrant developers can.  Don't worry, Phil checks every three minutes or so for the update on his Vibrant, so as soon as we see it, we'll holler.  [@T-Mobile_USA]