Hi Ceresco,
I'm not very good at the hard sell: I just write stuff and people either like it or they don't. The fact that the setting is available for
free online means that you know exactly what it is you're getting up front and can make your purchase decisions based on that. As for support, well, last month we released
The Cult of Fane, Part 1 of The Last Mage of Mount Fane trilogy, and this month (tomorrow, in fact) we will be releasing the second part,
The Shadow of Fane. Part 3 is due out in January 2006 (this adventure path will take characters all the way from 1st through to 8th). We'll also be releasing a fully fleshed out city next year, amongst other things. We also have our own
forums where we love to hear from people using the setting and help where we can.
From the list of settings that have been mentioned in this thread, I'd say they all look good and you can't really go wrong with any of them. If you decide to run with The Kyngdoms, I'll be delighted. If not, and you're happy with your choice and have fun gaming, I'll be delighted
Good luck in your choice!