Download and installation process was uneventful.
MANY settings have been reset to defaults, which will require time to re-visit and re-set.
Sorry, but I don't find any of the "improvements" particularly compelling.
WORST thing is what happened to the radio: Before this "upgrade", I had a rock solid and strong signal. Prolly the best feature of the phone. Now, it's as though I'm out in some remote area. In spite of a strong 3G signal still being present, the post-upgrade radio is weak and the wireless connection easily disappears. I am unable to maintain a continuous wireless connection for more than a few minutes at a time. The only means I have figured to re-establish a connection is to go into Airplane Mode and then switch back to wireless. A few minutes later, the signal disappears again. At this point, my phone is useless, unless I am on WIFi.
I've been willing to put up with the various foibles and defects of my Atrix(especially the "muffled voice" defect). But this is the end of the road for me. The Nexus S for ATT bands arrives at Best Buy on July 24, and that will be my ticket out of POS Motorola Atrix hell.