Within 30 seconds I could confirm that this little utitlity was 5 stars.
it's quick, small, and flexible. I like that I can adjust # of recent contacts, turn off the alphabetical list or groups, and change sort by dispay order.
Very useful that I can launch AB from the menu. Recent contacts are very useful, something AB doesn't have.
Bonus: I can make a new contact from the menu, and edit contacts without opening AB.
Everything works with or without AB launched!
WANTS: to be able to adjust the location of the menu item, not critical, but I prefer it closer to the calender, or at least further from the HELP menu in apps that have lots of menus. (menu meters, a 3rd party app can do this, even though many 3rd party cannot.)
(I can't speak about stability - only used it now for 10 minutes)