I installd Bill's system on my wife's 1995 E320 and it works great. The only problem is that if you lock the car with a master key, is sets the alarm. Unlocking it with the keyless system will set off the alarm. If you lock it with the keyless system, un-locking it with the remote works fine. I just tought my wife always to lock and unlock with the remote. Simple.
190SL, 230SL 5-speed, 95 E320 Wagon, 01 E320 Wagon, MGB, Boxster 'S', 190SL "Barn Find"