Unity is the incarnation of everything I hated (and worked hard to disable) in Windows 7. I rebooted and selected Ubuntu Classic as the default, and haven't looked back.
At an internship at MSR I recently used windows 7 for real, and after I got through the first week the general experience was maybe more pleasant than ubuntu with unity. Even things that annoyed me at first (grouping windows by program in the task bar, for example) grew slowly.
