I haven't tried their reader but you can get it for free with your subscription (http://www.newshosting.com/en/newshosting-usenet-browser.php)
I use newshosting.com (have for probably 7 years now) and love them. I also use www.newsleecher.com for it's super search feature to just "google" anything I want. You can also go to sites like nzbmatrix.com and use it as a somewhat variant of piratebay (for newsgroups) and get nzb files (like torrents... they just point to the posts to download). Download away and unrar/par everything.
Newsleecher has a couple nice download features that will warn if the files are rar in rars or passworded rars so you don't waste your time downloading crap sometimes.