I certainly prefer the 850 for b+w images as my example has a definite contrast advantage over a 720 converted to b+w. For color IR, my favorite was the 665 conversion. I wish I hadn't sold my 665nm Nikon d90 a few years back - I loved that camera!
They do not state if the CFA was removed in the process, but I'm guessing it was since the camera is about 2 stops slower than it was with visible. I think CFA removal is better for the UV shooters with naked sensors, not so much for 850 IR.
There is an issue with Uploading Photos (attachjments). I am not sure what the problem is, and I am looking into it. You can still try to Create your Threads and Upload your Photos, but it is hanging up during the Upload.