Oh, as for the 2-way thing... it's very useful as long as the people on the other end have half a brain. I avoid giving my 2-way ID to anyone who enjoys farting into the speaker or doesn't know how to use the alert button. There's some ettiquicy involved.

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Current Stable:
01 ML55 AMG
92 500E (a few mods)
87 300E (lots of mods)
00 Chevy 3500HD Diesel Box Truck
68 18' Donzi Marine
06 GT i-Drive7 1.0 Mountain Bike (with GPS!)

PREVIOUSLY OWNED:83 300SD, 87 420SEL, 88 420SEL, 90 420SEL, 86 560SEL, 86 190E 2.3-16V AMG, 94 E320