Everything works great as expected. I stopped using the K2 Sidebar Manager (SBM), since it was being phased out. I prefer the SBM. The widgets manager does not give you enough options or settings for displaying individual widgets. Mainly, the lack of options with the Pages widget compared to the K2 SBM version.
There is supposed to be a K2 SBM to widget importer in the works. It will be interesting to see how they handle the reduced options.