Been using the sobi search and sobipro search plugins from algisinfo since they first started making them made them till their their latest versions. I have thousands of entries in my directories and the search is fast and works perfectly. Worth the tiny fee. Thank you.
Since I needed an extension that could work with SobiPro and Joomla! 1.5.23 I decided to purchase aiSobiPro and so far installation, configuration and search results works perfect. It took me 1 minute to install and test it.