Tons of functionality right out of the box. Impressive amount of fields and modules to get the job done.
Ease of use
Has some learning curve. Encourages you to extend your knowledge of PHP and MySQL so you can create anything you want. It's pretty amazing.
I had outstanding support from Sergey and the forum. Special thanks to Sergey. Without his help and guidance, my project wasn't possible.
Plenty of stuff to read and video's to view to get you started. The forum provides a great source of tips, tricks, and example code.