I don't mind the missing optical drive. I do mind that these new iMacs do not have the ability for users to upgrade RAM ( please correct me if I'm wrong on this,) I thought I would get a new 27" IMac this year, but, maybe not, now.
Home user here. I sold my MBP a couple of months after I got an iPad. We now have two iPads in the house. I believe that within two or three more years, I won't even have my iMacs any more. The future is calling..