A few downers:
I wish you could set a flag when importing a batch of users such as, who is an admin, author etc. Right now you can only do it for the entire batch. But then again, all you have to do is separate them into a different CVS file and change the parameters.
But over all I can't complain. It works nicely.
The Attachements extensions fits my need perfectly. I only wish it provided some simple stats like number of downloads etc and the ability to choose the placement of the download links (currently only supported at the END of the article). Other than that I'm very pleased.