I'm a current LU member who joined about a year ago. I bought 1 house through them and captured more equity than my membership cost. I am personally managing that property as well as 2 others I have. For me, it has been wroth it.
I certainly recommend you take advantage of the classes, road-trips, and other networking opportunities.
Part of the guru problem is when people don't know your market and come through town in a weekend and tell you how to buy there. My experience with LU is that they are certainly not a fly-by-night group. All the LU people I've met are mentors as well as active investors in the market, so their opinions are based on actual experience.
The other guru argument show in this thread and elsewhere is that there is no secret knowledge that a guru has that you can't learn from places like BP. I think that's true and LU doesn't claim a secret formula as far as I've seen. I've had good luck getting perspectives from both LU and from BP. For me, LU was good at showing the whole process (acquisition, rehab, management) while BP lets me research specific points. With LU I can call and speak to someone live right when I need it. With BP, I have to wait for an answer if I ask a question (though my few new posts have been answered pretty quickly).
Other people with more background in REI might have felt that LU has less to offer. If you already have a network of contractors or a network of other investors, then perhaps there's less incremental value. But I don't think LU is in the same category with the "as seen on tv" crowd.