My rough understanding is that the SandForce controller reduces write amplification on uncompressed files and minimizes the write cycle by computing the most efficient place to put files and when to write them. It falters at reducing write amplification when dealing with files that are already "dense" such as DV or MP3 or zipped files.
But my biggest wonder is where it is storing this unwritten data or computational decisions. If it's just going to grab a little system RAM, that's fine, but I'm guessing it's still leaving pages dirty, and unlike many SSD's it's going to lack a capacitor to flush the cache. And we all know there's no capacitor on system RAM.
I can knock write amplification way back on any drive by using SuperSpeed's Super Cache and setting it to never flush its cache (built from system RAM) unless it receives a shutdown or stop cache command. Same for any better RAID controller with BBU. And then it hardly matters if the pages sit dirty since they have a BBU that lasts for days.
You guys need to do some real reviews of these drives by yanking the power or deliberately hanging the system and seeing how SandForce controllers deal with that.