I have installed the plugin on my own site, on other people's sites, and even here on WordPress.org. I installed it for Matt's site. So I don't know what problems you're having with it, but I assure you that it does work.
For example, if you examine WordPress's page on Facebook, you'll see the posts from the News section on this site also get crossposted there. SFC-Publish is what is doing that crossposting.
As for feedback, I get feedback on SFC *constantly*, as in dozens of emails per day. Mostly from people asking me to add features or how to modify it to work differently in some fashion. Sometimes people send me useful patches even.
I haven't really "tweaked" it in any way. It works with 3.1 the same way it worked with 3.0. No changes are necessary. It just works. People report it as "broken" usually because they configure their Facebook Application wrong and then blame it on the plugin. That's like 80% of the reported issues. Heck, I have an automated response setup just for that problem.
So, while I do believe that you're not making it up, without actual details on what problems you're experiencing, I can't offer you sound advice on how to correct those problems. What is the exact nature of the problem?