Firewire , Audio & Offset Issues = has apple resolved them ?

I've read a lot about the firewire offset issues on firewire audio devices using the built in OSX drivers.
Has apple resolved this yet?
Is USB safe to use?

I tried the firepod and could not use even a buffer of 64 at times.
Then I tried a usb toneport and got a buffer of 32 with heavy track and plug in content while playing guitar through amplitube with software monitoring on.

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