Theres a lot of screaming going on here.
I am a pb 667 owner, and yes, i hope that apple finds a faster chip ASAP.
However, I think the Altivec part of the chip is not an add-on, but an essential part of the processing power of the machine... and has always been. The main difference between a g3 and a g4 is just that.
Using the altivec in scientific software can give 2-5 times gains, as per numererous articles on the science area. And Avltivec is well suited to fft DSP, and live deals a fair bith with fft dsp i'm guessing.
Understanding that
a) Ableton is understaffed, or ,well, really busy!
b) Comitted to multiple platforms (Yea!)
c) Not sure what Apple is going to do with its processor
I still ask Ableton to please not consider the altivec as an 'additional unit" but an intergral part of the processor.
Almost all macs ship with the same processor now.
And I agree with tjwett, If you are just planning on using the pb with Live, then right now I would buy a PC.
As I get out more, and perform with other laptop musos, I'm sure I'll find out how different software operates on different platforms.
-Keith, SongCarver