just my
from a sponsor-pushing webmaster perspective:
approx 90% of my sales comes first from a trial on exit popup, 25% of them stay to at least 1 month recurring, and very few (the other 10%) sign up on the full monthly membership price first.
BUT...
That's just MY traffic, so -i- would choose to have an exit trial.
a friend of mine using the same sponsor, similar ads and traffic sources gets THE OPPOSITE, most sales to a full membership and very few to the trial.
so i say, offer a trial, give the webmaster the option to include it or not as an exit popup.
free periodically updated content is a big plus
where do i sign up? ;)