They have a problem with OS 4.5
Things are working great, then I loose sound on my Curve 8300.
I can call someone and it says that I am in a call, but the other party can not hear me and I can not hear them.
Vlingo support told me that this is a problem with OS 4.5
I was told their is nothing that can be done about it and the only way to correct the problem is a battery pull.
I was told that they would get this fixed in the next version and that they would contact me.

When it is working I was really impressed with it!