I have found Tiger to be sooo useful in the everyday flow that it has changed the way I work. It is oten quicker to type in the spotlight area at the top than go looking through folders even if you know where something is located. Tiger has a much improved Mail app and it is generally faster an more stable on my system than Panther.
As far as the GS importer I don't really use it except to type in project names which will show related pln files. In other words I don't search for layers etc. I don't see how that is usefull.
You should upgrade in general.
Archislave
archicad 26.0 US, M2 Macbook Air