So I have a 2009 Mac Pro, 16GB of ram, etc - and I had an OZC Vertex 2 120GB ssd drive. It was nice, quick. I bought a 256GB Crucial M4 (Only $179 on amazon!!) and...wow! What a huge difference in speed - it's noticeable in normal usage. Not only that, the xbench scores are much higher - I got 460 on the disk test, while on the OCZ drive I could barely break the mid to high 200's. What a fantastic hard drive. Even in the disk speed test, where I would get something like 60/170 on the OCZ, I'm getting 235/268 on the M4. I never knew on SATA II this drive could be so much faster than the OCZ.