I have tried all free map addons (except nagvis), and this is by far the best. Only few lines of code get this working. (So some understanding of php is needed anyway)
no version compatibility info, poor(in my case defunct) examples
I had to rewrite everything (nagios_hg.php,hostgroups.php,services.php) except map.htm for Nagios® 3.0.6. With no documentation or commentary on sourcecode provided.
Slightly better than writing all the code by yourself.