Would you like to see more pack trials in the future?

I haven't tried any since I usually grab the DLC pretty close to release, but definitely bring them on. There is nothing bad about demo-ing a game. In fact, it is really the natural order of things that some publishers forgot. Video games are an interactive medium; video trailers can only tell you so much.

If anything, I think the trials shouldn't be so limited. Per account, you should be allowed a timed trial of each DLC. If you're confident in your product and have a fair refund policy anyway, this should cause no issues.