PowerPC and Old Versions of Mac OS

Is anyone still using a PPC mac for music making?

I’m +RIGHT+ on the verge of killing PPC support. Would anyone notice if I did this?
Also, how old a version of Mac OS is anyone using? It’s becoming increasingly difficult (because Apple push pretty hard) to support really old versions.
Currently our oldest supported spec is PPC with OS 10.4.
I am thinking of moving this to Intel 10.5

** Is anyone using OS 10.4?
** Is anyone using PPC?

Let me know!