Recommendation for all-in-one with duplex printing

Hi;

I would also like to find an all-in-one to handle two main chores:
duplex printing and occasional faxing on a phone line shared with my
answering machine.

I am considering an HP 3390. Has anyone used one of these for these
tasks?

Has anyone had success with either (or better yet both) of these with
another all-in-one machine?

I am now the unhappy owner of a Dell 1815, so it is out of the running.

Thank you for any feedback or suggestions,

Jack