I just ordered an XF 100. Supply was limited before the disasters in Japan, as it's proven popular and supply was low to begin with.
I don't think the camera does perform badly in low light, from what I've seen - not worse than an XH-A1 does.
I also still think that AVCHD just isn't good enough for a variety of reasons, though native support will make the situation easier. I don't know where anybody is coming from about the XA10 being better. It's not and Canon wouldn't tell you otherwise. It is cheaper, though.
That JVC doesn't shoot .TOD files; it shoots files ready for Final Cut - native Quicktime.
Everything I've read says that the XF 100 is basically the best value in a single chip camera priced at $3,000. A lot of people who are not editors, or not very experienced will not pay a lot of attention to codecs, but they matter - 50 mbps recording at 4:2:2 in this price range has only been seen before with the HVX200 after many price drops. And there you have to deal with some other quirks and disadvantages.
And while 3 chips are usually better than one, that's no longer a hard rule, as much work has been done with single sensor cameras since the early days.
RED certainly doesn't see any issues with it, and neither do their users.