Yes, there's some spam unfortunately in the emunie forums, but not too much that you couldn't find the useful posts. I would say it's easy enough to get lots of useful information there. See e.g. the excellent summary posts that Jazzer made recently. Also, the shoutbox has always been a good source of information.

I understand that the eMunie client being closed source in the beginning makes some people sceptical. As long as this is so, you'll have to trust Dan (the dev). Personally, I'm willing to trust him because he has put a lot of energy into this project over a very long time, and has been very transparent about his plans. I think you could rip off people with less effort if you wanted to. After a while (some months or so) the client will become open source, as I understand it. Then everyone who wasn't willing to invest without being able to look at the source code can join. If you join later, there's less risk, but potentially also less profit. That's a very natural thing...