Well, 11 days after launch I gave it another try. Carbon is still buggy, but not BUGGY!
The negative comments have slowed down considerably - but plenty of people are still having all kinds of problems.
I would turn that URL into a link, but that's a bug that hasn't been sorted out yet.
The thing that has galled users the most is that only the support team has recognized that there is any kind of problem. Weebly has everyone's email address. They don't hesitate to use it to offer upgrades. The goodwill they are losing by not apologizing for the MILLIONS of wasted hours spent by their customers is staggering.
My future plans include at least one new website. I own a copy of RapidWeaver...and it is tempting. The cost to change is significant, mostly in my time to re-create the 400+ blog posts. But the satisfaction in leaving Weebly behind is significant, too.
Time will tell whether I stay or go.