I think that purchasing P5 at this point is a personal choice - many love it others (myself included) won't touch it a this point. I'd suggest reading up on seeing if the major issues that would concern you have been dealt with and making your decisions based on those - rather than personal recommendations. I had people recommend it to me only to turn around and reinstall P4 and tell me they were sorry for recommending it. I simply keep an eye on the sr beta forum here to see what issues are still present and if it's worth it to me - currently it isn't. Maybe someday it will be.

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I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use.
-Galileo