I've got all the units you mentioned (8010, 8040, & 530).
Of the 3, the BT530 is the best IMHO.
It has the best sound, the strongest and most stable bluetooth connection, and is the most comfortable.
The biggest issues I had with the 8040 are it's lack of an earloop and the poor performance in windy or noisy conditions. The 8040 would fall out of my ear after a fairly short period of time.
The BT530 has an optional earloop but the fit is so good that I haven't needed to use it yet!
Internet talk is cheap.
Man up, Show up, or Shut the @#$! up.
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