When pairing with the Blackberry 7520 we found the process very simple. The device was able to find the headset on its first try unlike the Plantronics M2500. The official range is 10 meters which we found to be quite accurate.
As per the quality of the sound we found it to be very good. It is less susceptible to wind noise and picking up outside noise. The only complaint was it seemed the headset was not as loud as the Plantronics. Additional features include the ability to transfer calls and to redial the last number directly from the head set.
We do find the Jabra 250 better in almost every aspect than the Plantronics M2500, fit, comfort, features, etc. This it should because the Jabra retails for $129.95 which is $40 more than the Plantronics. We think that the extra cost is easily justifiable and that the Jabra is the clearer choice for the majority of users.