UVJI5 upgrade applied to T-Mobile Vibrant using Kies (Canda version). Upgrade went like a charm. GPS works great now, out of 21 Sat in view 13 were locked. Lags are gone too, well most of the lags. However, I did notice some applications had lag in screen rotation - you will need to shake the phone if screen does not rotate.

Thanks for your info.

The GPS on the Samsung Vibrant has finally been fixed as well as issues with other Galaxy series phones. The problem with the GPS was that customers were having ot wait a little before a location was found.
The update that willl fix the GPS problem can be found in Samsung's Kies desktop software.

Other issues were that of the Samsung Epic 4G in which 3G speed was a problem.
The problem with the 3G speed was that it was running extremely slow, more like at 150 kbps. A Sprint forum administer had this to say:

“Good news – an update will be released 9/30. It will be rolled out over a 4 day period so not everyone will get it on day 1. I will have the standard MR information (fixes included, rollout schedule, etc) available tomorrow morning and will post it in a new featured thread.”

This statement was regarding the 3G speed of the Epic 4G. We will see today if this update is really for the speed.

via: T-Mobile Samsung Vibrant GPS issue fixed, Sprint Samsung Epic 4G upload speed to be fixed tomorrow » Unwired View