what about subjective speed difference between the two?
and are there any benchmarks between the two?
Tom's has both benchmarked in the charts, but you have to visit each individual benchmark, or at least those that interest you. For example, http://www.tomshardware.com/charts/ssd-charts-2011/AS-SSD-4K-Random-Write,Marque_fbrandx1487,2785.html
Given what groberts101 wrote, I would consider the issue closed. A beta tester for OCZ says that the earlier generation's controller suffers problems that the later generation's controller does not.