Some people are really stubborn. The hqx that downloads to my iMac gets a stuffit icon and cannot be expanded as it is. However, when you download the same file a second time the icon changes to a disk image. This you can doubleclick and this will work. Or you can add to the first downloaded hqx file name a space and 2 for instance, then the icon changes too and doubleclicking will open the file as it is supposed to.
After placing DW 3.0.1 on my HD I was able to rebuild other drives from there.
I only got an error message when I was rebuilding a volume that was on a drive with 3 partitions: device not properly removed. But that was probably because the other partitions were not removed from the desktop, but this was no problem, the rebuild went fine.
So all in all DW is a fine product.