PHPExcel - best practises for own files

PHPExcel - best practises for own files

I am currently transforming an existing project from the deprecated (and
old) Spreadsheet_Excel_Writer to PHPExcel and I am wodering how to best
utilize it.
I read the docuemtation and the examples so I am aware of the structure of
PHPExcel.
In the current project we used to create classes that extended the
Spreadsheet_Excel_Writer class like this:
class mySpreadsheet extends Spreadsheet_Excel_Writer{
private $some_variable;
private $andanother;
function __construct(){
//Init goes here
}
All the examples I've seen use a procedural usage to generate the content.
In general I do not have a problem in using procedural coding in PHP, but
I prefer an object oriented approch to keep the code more readable and
compact.
Any experiences? Advantages/Disadvantages? Cavenuts I missed out upon?