I'm not quite sure what everyone is referring to in terms of cross platform usability, set-up, or customization.
The module works as described and the author has available on the same download page one of the most concise step by step pdf installation manuals I have seen for a Joomla extension.
Some minor php edits were needed for the module itself merely to direct the module to the appropriate wimpy file, and may be the root of many peoples issues, however how to do this exactly is described within the author's instruction manual.
Furthermore, the wimpy code itself is easily customizable via their in-house script found on the wimpy site.
This has been a great addition to my site and was installed within 10 minutes, embedding perfectly to match my theme. I'm a php noob, and managed to get it up an running quick!