I've been using the Jabra BT250v with my Treo 650 for around a month now, and it's by far the best I've experienced. I was a big fan of Jabra's wired headset that uses the same design, and was pleased to see that the things I liked about that unit translate to this one as well.Two things that other headsets couldn't get right that this one solves:1 - it fits. The around-the-ear structure fits my ear well with no risk of falling off. This was always a problem for me with the Sony/Ericsson headset I was using.2 - no volume problems. For whatever reason, my problems with Motorola and Sony/Ericsson headsets was always that the volume was too low. Not an issue here.The big question is whether or not this headset will go the way of the other two I've had. The first two were small enough that I put them somewhere and lost them. That's a risk with the Jabra as well, but I'm much more careful with it.Installation was simple, as it is with just about all Bluetooth headsets. I don't know that I can comment about battery life beyond saying that I've never lost power, and I use it extensively.My only criticism of the Jabra BT250v is that it's fairly simple to turn it off by accident when adjusting the volume. The buttons aren't really that close together, they just feel the same. I'm hoping that I'll get more comfortable with this headset and that will become a non-issue.