As I am creating a new system, it really is not much of a point. Any of the E6xxx Core2Duo should be sufficient. But, if you have a current system and see problems, which you pinpoint to missing CPU power, 8-10% may be helpful for you. I'd be very interested to hear your findings, as soon as you get a chance to try it out.
All tests I have done so far do not show an increase in speed for most applications, but those tests are NOT LMCE related, which is my reason for being interested in real-life experience.