I wasn't sure how this would all play out without Michael Scott but I think they are on the right track. Picking James Spader, and then explaining his ascension to CEO, was the only true choice. They needed a character who wasn't like Michael and his manipulative, dark tendencies is perfect. Especially since he clashes with certain characters in his own unique way. So I'm fully supportive of them picking him. I'm not sure if he'll be in every episode but at least he's fresh. His response to Erin's boring story was hysterical and so true.
I don't like the choice for Andy to be manager at all though. He is and was too much like Michael for it to work. His whole bit at the end about how everyone in the office are winners was too Michael Scott-esque and far too sappy. I honestly hope that doesn't last long and would rather see Dwight usurp him or maybe every few episodes a new person in the office steps up and is the boss so we can see how horrible and clueless they are without Michael even though they think they can do better. It would be a lot more entertaining, like when Creed was the boss for about 30 seconds, haha.
That being said, Dwight was the best part of the episode. I always love how they rip on stupid internet sensations (this time planking) and the scene with Kevin planking on Dwight's desk was awesome. Even better, when Dwight, Andy's 'Enforcer', is told to end the planking and he takes a fire extinguisher into the women's bathroom and sprays Meredith atop the stall I was in stitches. That's the sort of thing the show needs to keep if they want fans to keep tuning in. Write what you know works and don't try to clone Michael Scott. You just can't do it successfully.