Hi Wayn,
Are you sure you wanted to post this as a review?
I am always open to discuss compatibility issues, you can see this by reading the support threads (I hope). Your notice is however important and I will include this requirement everywhere possible to give plugin users a clear notice before installing.
About PHP: I advise everyone who is using PHP 5.3 or earlier to contact the hosting provider and ask for an upgrade. PHP 5.3 or earlier is not supported anymore, a hosting service running PHP 5.3 or earlier is simply out of date and insecure.
Wayn, besides this PHP issue have you tried other plugin features on a server running secure and supported software? If yes, are you satisfied with the feature set of this plugin? Or this one star rating is just about your experience about the PHP issue?
I would be happy if you could also write about this and maybe change your mind about this rating.
Have a great day,
Thomas Geiger