WPF data grid - what are YOU using

[onemenny]

Hi all,

for those of you who use WPF data grid control from the following
providers:
Xceed, Infragistics, Rad/Telerik

I'm looking for your opinion regarding WPF data grid controls.
i understand that some companies deliver more products in their
bundle, and may be considered more "Cheep", but all n' all, i want
your opinion just over the data grid itself.

how easy it is to use?
documentation? (<- specially documentation and examples)
support?
extensibility?

for reference ((http://michaelsync.net/2008/08/09/any-recommendation-
for-wpf-datagrid))