Using QuickBench 4.0 for a while, now I can post some very inspiring results !
My original MacBook Pro 13" mid-2009 Toshiba HD 320 GB
The same MacBook Pro 13" mid-2009 with a Seagate Hybrid Momentus XT 500 GB 7200 RPM
And yet the MacBook Pro 13" mid-2009 with a OCZ Vertex 3 120 GB SSD
Now my brand new MacBook Air 11" with Samsung 512 SSD from Apple
I can say that I'm quite happy with the SSD SATA III performance
My original MacBook Pro 13" mid-2009 Toshiba HD 320 GB

The same MacBook Pro 13" mid-2009 with a Seagate Hybrid Momentus XT 500 GB 7200 RPM

And yet the MacBook Pro 13" mid-2009 with a OCZ Vertex 3 120 GB SSD

Now my brand new MacBook Air 11" with Samsung 512 SSD from Apple

I can say that I'm quite happy with the SSD SATA III performance