This may be true when using data the is highly compressable - Not real life.
If you look at AS SSD benchmark for the M4 using Firmware version 9 - It is right up there with the Vertex III MAX IOPS SSD Which is there High end SF2281 SSD.
Ref:
http://www.anandtech.com/show/4712 [...] h-fw0009/3
Still take Benchmark with grain of salt as review was for 256 Gig SSDs and 128 gig SSDs tend to be lower.
For benchmarks I prefer to look at are AS SSD or better yet look at PCMark vantage scores (closer to real life), Both overall and for the individual task you most offet preform.
My comment to an earlier post asking about vertex II/agility III:
You will not see a big diff between most of the new SSDs (Sata III and even the New Sata II).
The specs you quoted are for Sequencial read /writes which are the least important metric when looking at a OS Plus program drive. Look at random 4 K performance.
That said, if you do a lot of work with LARGE files, and they are on the SSD then Sequencial performance is important; However most put these type of files on the HDD.
Also on seq performance qouted speed is for data that is readly compressable (not real life). The Sequencial speed for SF22xx drops off when compressed data is used in the test.
I prefer marval based Sata III SSDs like the curcial M4, and Intel 510 uses. For SATA II my preference is the Samsung 470. Notes Samsung is coming out with an 800 series Sata III SSD.
I have 2 120 gig Agility IIIs (will never buy again) and two Crucial 128 gig M4 which I'm very happy with.
Just compare the dissatisfaction ratio between the Aggility III and the M4 - Night and day!!
THERE is a reason the agility is Cheaper!!