It is pretty easy to get into the open beta, so I'm guessing the vast majority of lifetime subscribers will have already tried it out that way.
I actually regret not buying the lifetime sub. for LotR Online. I would be in the black at this point. But I also don't mind paying a few bucks a month for a great service, so there ya go.
It looks like an interesting game, bit different than the typical MMO with the ship design and all that. I might go fr a trial someday, but I'm not a huge ST fan, so I'm not dying to play it.