Well we've done the Chef Mickey Dinner and Breakfast, so we can say we did it. Both were "OK". The kids loved the characters. This trip we didn't book it and aren't heartbroken. Its so busy. The buffet gets dirty and sometimes the food is cold. Plus its so crowded.
Ohana Breakfast is actually our favorite character meal. We just booked our 3rd time there. The characters are Mickey, Pluto, Lilo, and Stitch. they are in hawaiin shirts and they give the kids a lot of attention.
There is a parade with instruments if the kids like that. If not, no biggie.
When my daughter and I went just the 2 of us - I think Pluto visited her about 5 times. The 2 of them just kept playing and playing together. We had a later breakfast time, so it wasn't as hectic.
The food is family style in a big skillet/pan on the table and they refill as you need it. Also, they are very good with food allergies there and made my son his very own "safe" mickey waffles so he wasn't left out. The juice is really yummy (a tropical blend) and the coffee is fresh vs the bad coffee you get at Chef Mickeys. We like how the family is all sitting together and we don't need to do the buffet trips which can be a pain with the kids.
Definitely a vote for Ohana!