I bought this to use with roll20. Overall I am very impressed with the quality and high detail of the set.
Pros: A great set with multiple combinations that can be used over and over. The single to double to triple passage ways makes for unique builds that look original while reusing the same tiles.
Cons: For Roll20 the size of each file is very big. Only using a few and I almost filled up my allowed storage space (100MB). The files took a little longer than needed to size correctly to each other after importing. Also there were a couple of files that were over the import limit (10MB) so without some way to compress them you cannot use them in Roll20.
A great set, but would not recommend to use in Roll20.