It allows you to easily track the average ratings across multiple articles as well as place frontend modules for top 10 articles. This is perfect for my website which profiles musical artists and gives awards based on ratings the different artists received. It took me a long time to find a component this good, and it is well worth the money it asks for.
Also I should note that the support for the component is excellent; A short time ago I rebilt my website and upgraded a lot of my servers systems, which caused an error in the components reinstall.
I posted a support ticket and even though (unbeknowest to me) my support time has ended the creator still responded in less than 12 hours with a full solution that solved every issue I was having.
Excellent communication and Support for an Excellent component, who could ask for more.
And for Joomla 1.5 this is the best one I have found. The free version is not limited in any way, it simply has a copyright link included - which is perfectly reasonable in my mind.
I tested out the free version and found everything worked very well, the editing of the polls was excellent and made setting up the modules I needed very easy. I have now ordered the pro version so I can launch this on my site and at just 10 euros (£8) it is well worth the money.
The only downsides are that the modules dont seem to have the option to change the look or style. And editing the main templates is also hard, but all are possible with a bit of time.
The only thing I would like to see in the future is the addition of a time mechanic so that users could vote more than once. e.g. they could vote once every 24, 48 or 72 hours for example.