i've used mine in full logic since about 2 days after i got, when the novelty of the thing going off all the time wore off. it doesn't get rid of all false alarms, but quite a few. if still works really well on "real" radar. of course you get used to the false alarms in your area, (most of which are "x" band...), but i pay pretty close attention when i leave my immediate area.
Mine is always on AL unless I remember to set it back when making long trips. There is a list on the net (can't find the link) that tells what bands your local police use. If you local area doesn't use it...turn off x band. Police in Wash state use x and laser so I can't turn mine off.