I've used successive versions of this headset for the last 17 years and love the design and manufacturing quality. The set up guides are clear (if sometimes a little convoluted) and in general, they work beautifully, for years (I have a previous version at home that I bought in 2001).
The choice of over-ear wear suits me best, as it doesn't mess my hair; it's light, unobtrusive and can be comfortably worn all day. If you have the headset lifter attachment, you can pick up and terminate calls away from your desk. Range is good, clarity crystal clear and the battery life in the headset itself seems to last forever. If you should forget to replace the headset to the base station it will discharge overnight, but quickly recharges again.
Technical support from Jabra is good (I needed lots of help when using VOIP telephony and they were very patient) and my vendor, UK Surplus Central Limited, very helpful too.