Thats great One_Hertz

I'll have to check on the m4, there is probably an issue wrt retrieving "Host Writes" on both the C300 and the m4. (WD doesn't support/report host writes either)
The SandForce and Intels are both supporting this and some report both host read and host writes.

There is probably a way to circumvent the SF throttling issue but it would require cleaning the drive at least once a week. (only takes a few seconds using the toolbox)
I cannot guarantee that the cleaning would work though.

I'll check the Crucials and let you know...