I don’t know about you, but I’m pretty used to my key combinations in Windows. My job is programming, which means that I live and die by the keyboard. I expect the keyboard to behave in certain ways - those shortcuts are what keeps my typing speed up.
Yes, I have been able to remap some of the keys, but seemingly not enough.
Also, this 400MHz G4 (new to me) is slow compared to my Athlon 2200+ desktop. Well, I suppose that is to be assumed given the wide disparities in clock speeds, but still, it doesn’t help my impression of this thing.