I have my Atrix, as well as 3 others to keep up with (My fiance and both of her kids).
All 4 of us had many of the issues CodeMonkey mentions on FroYo. Since updating all 4 phones to GB, I can tell you that it makes the phone like new.
You say "If it's not broke, don't fix it." There are enough improvements in GB over FroYo that you don't realize how "Broke" some things are until they are working right.
I don't regret the update. I just wish they would push out the 2.3.5 update with the newer version of MotoBlur that they are shipping on the Atrix2.