I was using the plugin for a while. But then I noticed, my website does not appear no more in search results.
The problem is that the plugin does not make any difference between a search engine and a mobile browser.
So you may end up in serving a different content to Google bot - which is in contradiction with google recommendations for content (see: https://www.google.com/support/webmasters/bin/answer.py?answer=35769&&hl=en#3) ,especially if you are using it in combination with Buddypress.
Course that may cause your website to be removed or even blacklisted from search results.