-easy to install
-easy to configure
-easy to use
I had some problems with enlargeing board, but the wiki on the projects homepage was really usefull.
And one thing what I have to mention:
Support is great. I have sent an email, with my issue and questions, and the helpfull answer was in my inbox in less than half an hour!!!
Congratulations for developers! You made the hard thing.
Something bad if I really want to tell: ... no. I do not want... :-)
Perfect solution for a very special problem.
Thanks a lot!
For everybody's information, the issues/questions were about a new technique to customize the chessboard size and other features, without the need of manually editing the extension files.
You can read all the details from the FAQ questions at the bottom of the pgn4web wiki page http://code.google.com/p/pgn4web/wiki/User_Notes_joomla