For slide-formatted pdf to ppt, I use a number of tools with varying results. Because the results are dependent on content -- as well as the initial setup of the ppt environment (backgrounds, etc.) -- I suggest you experiments with some of the free tools before moving on to the more costly solutions. For other than extracted slides ... I have not found an acceptable tool to automate the conversion of pdf files into PowerPoint. But I do use Ppt To Pdf Converter Professional to export graphics to individual files and to recognize text using OCR. Then I cut-and-paste the wanted copies into my PPT format. I do my footnotes as the last slide -- then I can use hand-outs, projected talk slides, or make the entire package available on the web.
I have no problem with PowerPoint's format; just don't use it when you really need a PDF file for a different presentation format, or want extra features. I'd rather have the convenience of being able to create a PDF file from a PNG image and import it as an attachment on SlideShare.com -- instead of being told I had to create a separate file. The fact that this is not possible for everyone is due to the way PowerPoint is created and presented. I'm happy to see other people are starting to create PDF templates from PNG and other image formats. If you like PPTs in general, be sure to check Outlier's free tools that combine a powerful PDF editor with customizable templates. I haven't seen good tools for extracting slides to PDF yet. This has been my challenge for years: How to extract single slides? I've had some.