Nothing too monumental, but on my setup (2R0 Vertex 2 50GB with FW1.10, 32KB stripe), Anvil's "67% Compression with No Dedup" setting has a write amplification of ~1.185x. 192GB of 233 SMART took only 162GiB +/- .7GiB. Will retest on a single drive with newer firmware later unless somebody beats me to it.

I have no way to write, in bulk, my C: and D: stores to my array, so that testing will have to wait as well.