I hope it is OK to post a few positive things in here as well instead of complaining only?
I just imported a couple of files into a shared catalog. Playing with this catalog from my laptop really amazed me compared to the standalone. With the standalone it always took a few seconds till the thumbnails were refreshed after scrolling or when I selected a couple of images there was some delay till the combined properties were shown. Now with the server version the response is almost immediate.
Keep up the great work!