I have a Lumia 920 that works fine for receiving and responding to text messages. Going to the uConnect website through IE also works fine for remote starting and what not.
Out of the box? No. I had to go to Settings > Ease of Access and turn on "Speech for phone accessibility" before the "Blue" update. I haven't changed anything since on the phone and have updated uConnect with every update posted. It has never stopped working for me.
The current Xbox Music app (not the developer preview 8.1 version) works very well too over Bluetooth and always had. Add an Xbox Music pass to that and you'll never get bored with the tunes. I just download the playlists to my phone and do not have to worry about data charges for streaming. I do worry about the speakers though, The Black Keys over Xbox Music through uConnect sounds real good!
I rarely post, but I'm somewhat stunned that there are three of us Lumia owners on this site.