2 OOP or Not 2 OOP

I've decided it's time to learn how to program using PHP's OOP. But, I just found this article which is giving me second thoughts... http://www.zend.com/zend/art/mistake1.php#Heading13 The article was written in 2000, so, it may not apply now. Is OOP in PHP 4.3 slow and incomplete as the article states? Or is it much better now? I probably won't be moving to PHP 5 in then near future, which apparently has much better OOP support. So, I can't decide if I should just go ahead and start using OOP in PHP 4.3 (as long as it's not slow and klugey) or if I should just wait until I get PHP 5? Anyone have any insight?? - Monty