My own impressions, with the 7290,
Plantronics 3000 - I agree with the review, excellent headset, except that it's very large and looks dorky. But worst of all, for me, it just doesn't fit well, and causes discomfort even for short periods of time. Of course, the fit is a very individual thing, and it could work well for someone else.
BT800 - ordered it before reading these reviews. It should arrive today or Monday, and I'll post on my results with it.