I used to be a KDE user. I thought KDE 4.0 was such a disaster, I switched to GNOME. I hate the fact that my right button doesn't do what I want it to do. But the whole "break everything" model is painful for users, and they can choose to use something else.
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What is the conclusion? We on the the open side of the software world all have one thing in common - Choice! Use what works for you!