I've been a member of the Wealthy Affiliate Website for a bit and have pretty solid experience with it. You can see a whole list of features
at this webpage, but I'll just jump through the various questions you asked in my answer below:
-the features: all the features are pretty useful. Sure, there's some I don't use everyday, but there are some that are absolutely priceless. Specifically, the discussion forum is absolutely amazing! Having access to thousands of successful internet marketers is priceless...honestly priceless. I've learned a ton.
-I've been a member for 6 months, and will likely be a member for the long haul. I learn something new everyday that makes me more than enough money to cover the membership.
-I log in and review the discussion forum over coffee each morning. I just scan around, see what's new, and sometimes come across a new resource or two. It keeps me on my toes and thinking about how to advance my internet marketing experience throughout my day.
-I've made money from the site...probably around 8-10K in profit so far, but it's all been part time. Also, that included my 8 week course that I went through at the wealthy affiliate website, so there was quite a learning curve in there.
By the way, you may want to check out the testimonials section
here. I know it's a bit like sales jargon, but the stories are pretty motivating, and (in my experience) accurate.
If you do end up checking it out, best of luck with the Wealthy Affiliate Website