Where to get pdfs of patent-patent applications?

Many online services offer .pdf versions of patent or patent applications. However, they have serious limitations such as for instance a poor or (unfriendly) user interface, fees charged for downloading the reference, registration required.. Some even act as bots which download a reference page by page to generate the full reference in a single file.

http://www.patents.com/ offers an efficient way to find a reference and download it in a single pdf file without complications. Although it is limited to US and EPO patent-patent applications, I find that this webiste is great for that purpose.