Last year, my friend upgraded his GirlFriend 3.1 to GirlFriendPlus 1.0 (marketing name: Fiancee 1.0). Recently he upgraded Fiancee 1.0 to Wife 1.0 and it's a memory hogger, it has taken all his space; and Wife 1.0 must be running before he can do anything. Although he did not ask for it, Wife 1.0 came with Plug-Ins such as MotherInLaw and BrotherInLaw.
Some features I'd like to see in the upcoming GirlFriend 4.0...
I tried running GirlFriend 2.0 with GirlFriend 1.0 still installed, they tried using the same I/O port and conflicted. Then I tried to uninstall GirlFriend 1.0 but it didn't have an uninstall program. I tried to uninstall it by hand, but it put files in my system directory. Another thing that sucks in all versions of GirlFriend that I've used is that it is totally "object oriented" and only supported hardware with gold plated contacts.
Wife 1.0 has an undocumented bug. If you try to install Mistress 1.1 before uninstalling Wife 1.0, Wife 1.0 will delete MSMoney files before doing the uninstall itself. Then Mistress 1.1 will refuse to install, claiming insufficient resources.