I upgraded.
For the 20 bucks, I got to keep the rest of the 30 day trial days, added 30 more days, and all of the limits (level, AH, mail, etc.) went away.
I'm having a pretty good time, but I'm sort of playing it like a really immersive single player game with great AI.

So far I've quested out of Midway, Orenville, Embry Crossroads, and now I'm out in Oilville.
Roughly 70 percent of the equipment that I'm using, I crafted, which is kind of cool and and helps keep that post appocalypse tinkering with garbage vibe going strong.
-dr