Has anyone on our forum used one of these or have any experience with them.

Yamaha AG Stomp Acoustic Guitar Preamplifier

http://www.yamaha.co.jp/english/product/gu...itaramp/ag.html (http://www.yamaha.co.jp/english/product/guitar/guitaramp/ag.html)

Specifically, how does this compare to the L.R. Baggs Para DI, Fishman Pro Platinum Preamp, Raven Labs True Blue, DTAR Equinox?

Any information would be helpful. Thanks!