Adding SSD to Late-2007 MBP? Advice/experience requested

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1.5 Gb is 192MB/s. Your Scorpio doesn't get close to that. So SATA bus speed isn't a huge issue.

I have a early 2007 MBP and had a SSD in it. Very snappy compared to the stock drive. I downgraded it to a Hitachi 7k500. Small drop in speed, and certainly in boot and app launch times. But other than that...

I don't know what the speed of the MBP's ATA bus is. It's not listed on the Apple site http://support.apple.com/kb/SP13 or everymac.com.