You've got 1 year to use up your 96 GB and you can renew at any time, uploads/header downloads aren't counted, a.b.c.i.x has a 2 week file retention and downloads are somewhere in the area of 5 megabits/sec (depending on your connection of course).
Only 1 server though, so you may occasionally find yourself asking for fills, but in general completion is very good.
I used to use usenetserver.com. I strongly advice that everyone stay away from them. When I left there were very serious talks of a passive UDP by several large usenet providers due to spam and mismanagment.
*edit*
I just saw the post by Malibuman, so I'll elaborate more about why I left uns (usenetserver)
poor retention
a.b.c.i newsgroups had at best 4-5 days retention...it was usually lower. Really huge groups like a.b.s.m.c and a.b.c.i only had 2-3 days.
sorry, no news today
UNS has 3 servers, but they went down more often than a Windows ME database server would. I'd been a member for 3 years before I canceled, and I say that maybe only 6 months of that time was totally trouble free. They had a nice bug for at least half a year where a file would have all its headers in place, but when you tried to download the bodies, guess what, a couple would come up missing! It was dubbed the 'disappering headers bug' in the UNS support group. Anyone else remember that mess?
Less for more
The reason that I stayed with them through all that mess was the fact that they were dirt cheap! 150 annually bought you 13 GB/month, but due to a bug in their accounting software (at least for my account) downloads were not tracked...so basically it was unlimited usage! Downloads were usually absurdly fast too, I was able to pull 4 MBytes/sec (32Mbits!) on a good day. So just a little insight into how the company works:
UNS Engineer: There's a major bug in our accounting software that is going to be *very* expensive to fix.
UNS Managment: Lets change our usage plans to unlimited usage so we don't have to fix it!
They apply this logic to everything they do, me thinks.