Comment 9 for bug 655950

I think the failings here are obvious. It really shouldn't need explaining imo. Is it the intention to frighten prospective users away entirely (after wiping their Windows installation, that is)? If so, good job.
If confirmation is required, have a look in the forums or take note of the (no doubt) increase in the number of times testdisk has been downloaded.
As a somewhat experienced installer, I always select the manual partitioning option as experience has taught me not to trust any installer. Less experienced users will have no trouble whatsoever hosing any existing installation with this installer. Maybe it should be renamed Ubiquity os-hoser.