Unless you have a soft spot for MacOS as an ex-user (I am not), then absolutely no. I had installed latest MacOS versions available both on a G4 and a G5 and the system was much less responsive compared to MorphOS. It has a terrible internet browsing experience compared to latest OWB, the video players tend to crash playing the same video formats that MPlayer does just fine and similar games were smoother on MorphOS as well. If you are going after for the games that don't exists on MorphOS (such as Doom 3) you will be disappointed to find out that they play much better on a 10 year old pc laptops that cost approx. 50 euros. Btw the user experience was much worse comaored to some Linux distro I had also installed at the past. Bottom line, my macs are single booting MorphOS.