There is no sharing on your part. The only limit to how fast you can download is your connection. The newest files are there first, with no waiting. Depending on the provider you use, there is upto 90 days to download anything before it is removed from the servers. Not to metnion that there is almost no risk on your part when downloading.
I think it is WAY better than torrents. Files size and watching my back is no longer a worry when downloading. Usenet is well worth the money. Now thanks to NZB files, if you can use a torrent you know how to use Usenet. Very easy to use.