Yes it works well. It’s a very simple function but never found a mobile device not recognized by it. It recognize the 90%+ of mobile devices. Main difference from mobiledetect.net is that doesn’t differe from phone and tablets.
If you like this question & answer and want to contribute, then write your question & answer and email to freewebmentor[@]gmail.com. Your question and answer will appear on FreeWebMentor.com and help other developers.