Works for me (mostly)

On OS X 10.9.5 the app mostly works for me and is worth its price. Watch out for the two search boxes, you use the one on the left to search for articles and the one at the upper right to search within articles. The UI is a bit clunky but the ability to easily search within articles is appreciated. To change the font size, set the desired size in the Preferences and refresh the article (but see below). You can also set the translation(s) of Wikipedia you like to use. Wikipedia pages are rendered as expected including tables and images.

There are a few bugs however:
• preferences are not remembered between runs
• history is not remembered
• the “Pictures" slideshow crashes
• the toolbar is a non-standard implementation and can’t be switched off or edited

Bozo Clown about Wiki Reader