I certainly applaud your discretion to get some info before making the plunge to upgrade. Most of the issues have been with PPC users and FCP6. I am going to try a test today with a new intel mac and try to get to the bottom of this. FCS2 is actually really great once everything is working as it should…
As far as 24p, 30 and 60p are concerned, use what you fancy. If you prefer 60 and your clients do then there you have it. I always tell people to go for their own signature look. Once you have a style and a look people will recognize your work and seek you out for it. Hope this all helps.