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Bluetooth (like HDMI) is a confusing mess for the average consumer...let alone for engrs who know what they're doing.
It means nothing to say your computer supports 'bluetooth'...what's more important are the profiles supported by the bt stack...and often this is NOT (wtf?) printed on the product packaging or in notes on product (on Amazon, etc.).
Adding to mess is fact that it is often not possible to update your bluetooth stack easily. For example, my Fujitsu ST5111 tablet pc uses bluetooth from Toshiba...and there are zero instructions (or help from Fujitsu) on how this can be upgraded. Version shipped with Fujitsu doesn't match what is on Toshiba's site.
I have yet to find a dongle/stack that seamlessly supports voice and voip seamlessly...you must manually switch profiles when getting a call and this can never be done in time to get call...
I seem to be constantly re-pairing devices...even though they haven't been paired to other computers...
The class 1 adapters (with long range) are all they should be producing...short range bluetooth craps out by merely having your phone clipped to left hip and earpiece on right ear. With class 1 it works the way you would expect...with 1-3 room radius in your home.
This said...BT is great (at least when you have high-power and edr) when it works.