I'm assuming you're referring to package 4.6.1.379 with applications version 4.6.1.250?

This is the version that *had* been leaked earlier as beta, but is now distributed as a production version by at least two carriers. I was using 5.0.0.100 for a couple of weeks, but found it too quirky and not quite ready for prime time, so I too fell back to 4.6.1.250. It's OK, but not where I want to be with the 8900: battery life seems very good on 250, but there's a lot of lagginess in normal operation. I often see multi-second pauses after doing simple things such as: change profile, use the "delete prior" function to delete half a dozen email messages, etc. Beta 5.0.0.100 was much snappier in this respect, but the errors outweighed the positives for me. Really looking forward to a more stable 5.x.x.x