Great IF the Win 7 image system wasn't so slow
12 to 18 hours to image 85GB? That's really wierd. There really must be something wrong with your installation. My 50GB installation only takes about 30 mins with Win 7 System Image backup and it was imaged to another partition on the same hard drive. You should consider doing a clean install to fix whatever is causing it to be that slow.
Oh, BTW, I have also used EaseUs ToDo Backup free edition. It offers different levels of compression to save save at the expense of speed. Perhaps I should try Macrium and compare the results.