I'm going to buy just a cheap plan for a couple of months to see how this pans out. All I'd like to know is that: will all NZB files download without error? So, even if I choose to use a really old file, will the files inside of it still download?
no, not necessarily. Btw if you're thinking of using the usenext service, don't. They take your money and don't give you your download credit, then months later threaten to sue you for non-payment. try giganews instead, you will need to provide your own client program though.
Whew. Not going with them thank God. I've gone with Fast Usenet. It seems legit, and has quite cheap plans. $3 for 6GB of data is alright. And it has some good reviews. Thanks for the help Loony.