bt 'bullet' receivers are much better if you ask me. A stand alone will eventually get outdated. A bullet can move from unit to unit, and uses software that is much easier to update, and updated more often.

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Sprint Mogul (PPC-6800) - dcd 3.0.1 ..... 3.35.04 ..... OliPro 2.40 ..... 60610 PRL
Sprint PPC-6600 - 2.07.00 WWE ..... HA00_166 (spare phone laying around)
Sprint PPC-6600 - 2.04.00 WWE ..... HA00_140 ..... 1.36.113 WWE (used for GPS only)