Before Voyager had that deal, I bought "Revolution" and "Element V" on iTunes. I prefer buying from the band's site when possible (see: Sabaton).
I really enjoy everything I've heard by Voyager. Their latest is a little less multifaceted than Revolution - but a really fun disc, nonetheless - it's in my car as we type.
I'm not sure what the latest trial membership terms are. They have varied over the years. However, if you do a quick search on "free emusic trial" you'll find plenty of people complaining about getting hosed trying to cancel quickly.
I can only tell you that I have come and gone from the service many times over the years without penalty. I finally signed up for a yearly membership to get the most bonus credits where it makes it a pretty decent deal if you like to download legally.