I am sad to say that I have not :0(
I think that it is much more versatile than the eTES.
More BTU's
You can duct outside are into the intake. (this is great in our very dry climate during the winter)
You can duct the heated air to airmovers or injecta-drys
Another plus when ducting outside air into the Firebird is the clean air exchanges improving the IAQ
