I have the extension so have been having a look at changing a page to use mySQLi.
I have gotten as far as creating the mySQLi connection, and also added a couple of record sets to a page.
The page is reporting that the recordset is empty even though it should have some records, and displays records in phpMyAdmin. So I'm not really sure how to check it should have records, or how to echo them - I have tried adding a mySQLi recordset, but something isn't right.
The page is here: