Very limited!

Files can be merged, but they must be pdf. Cannot edit newly created merged file. Pages may need to be moved around within the file. Its kinda complicated to use at first.
I give a 1 star due to limitations of the program and price. Too expensive for what it does. I recommend pdf Splicer it is more flexible and merges non pdf with pdf files, and pages can be moved within the pdf file. Good luck!

svlmtype2 about PDF Merger