I still haven't had much time to put Eco to test. I did, however, check out the incredible libraries that Platinum Samples put out for it and Joe Barresi's kit is simply jaw dropping.
Since I didn't want to upgrade to BFD full for the moment, I checked the Eco Kit. The one thing that kept me from grabbing it is the machine gun snare at 18 seconds in the first demo. I suspect this might be due to some limitation in the BFD engine - I didn't hear anything similar in the BFD full version.
http://www.platinumsample...coKits/EvilEcoKit1.php Maybe someone can shed some light on this...
Otherwise, I've been a fan of EZ and now SD even since I've first tried EZ. Overall, the BFD kits seem to sound more natural. If I were a drummer, I'd probably be inclined to use BFD.
EZ and SD kits seem a bit more "prepared" - not as excessively as Steven Slate's SSD kits, but kinda half-way.
As a songwriter and "aspiring engineer", EZ and SD puts me a few steps further on the way to a good drum sound for the song w/o being as processed as SSD, so I can still polish them a bit and make them work in the song myself.