Just flashed my 1.4 box - easier than pie!
Winbond chip, there appeared to be some problems with it in this forum, but it worked great. I suppose those who had problems screwed up the soldering.
Took me ~2 minutes to solder, I don't know how anyone could screw that up, really easy. I have been soldering stuff most of my life though, so who knows.
Used Raincoat 0.7 in 007. One problem was my router runs on a 192.168.2.* net locally, so I had to reconfigure it and then set DHCP to assign 192.168.0.64 to the Xbox's MAC address.
Once I got the network connected, the flash went perfectly. I'm tempted to reflash to fancy up the boot a bit (I left it green, completely stock EvoX M7 bios with eject fix, didn't want to fuck it up) but it's probably better just to be safe and disconnect the points.