This is an early review, as I have not had a chance yet to actually construct the buildings yet. Looking at the pdfs & instructions, Fat Dragon has gone to a different method of stacking their floors, which will limit the interchangeability with their Base set. This method looks simpler, however, which should be appreciated by fellow beginners.
The cellar doors, balcony, and raised streets should all be welcome additions to your game's towns. As is normal with Fat Dragon's sets, the textures are wonderful to look at. Note also that the edge of foamcore visible at the base of the raised platform is not actually visible in the final product, as a 'cover' was added to the piece to address the issue.