My current camcorder is AVCHD. When I got it, it was a new format, unsupported, and slow to process of course. I actually like it a lot now, as long as I can use my Quad core and PP CS5 to edit the footage.
Mine records 1080i Anamorphic, but the file sizes are smaller than SD, so it does have some advantages. Definitely unusable though on a weak machine.
But for a $2,000 camera that is being labeled as professional, it is an outrage to use AVCHD, as opposed to XF.