Unfortunately there are so many bugs! The problem is that the component as it was at version 2.1.7 (no more upgraded since I modified it too much to have a site working) should have been rated as pre-pre-pre alpha. In no way it should have been distributed to use in production sites (since simply there are so many features broken).
This said, if I would have known all these problems I would have gone as well with the component because as said, it's the best (about features richness), but at least I and my client would have been conscious that it would have needed extra work to fix all the things broken.
Now I quite fixed everything (something, according with my client will not be fixed) and I introduced many hacks to accomplish my client needs, this of course prevent us to continue with upgrading and support.
To be clear: I dont' want to complain. Just suggest joomclan to think if possible to revise their delivery policy.