Hi,
As for your questions:
1. No. Unfortunately it's not possible to perform copy and paste;
2. The advantages are the amount of features and customization options. We have many features the standard TreeView control does not have, such as drag drop, in place editing, checkbox, context menu, etc. You can find live demo about these features here:
http://www.essentialobjects.com/Demo/Default.aspx?path=TreeView3. You can find the price for our product at here:
http://www.essentialobjects.com/Purchase.aspx?f=1 Please feel free to let us know if you have any more questions!
Thanks