Anthony
There is only one good one! The Twin Air from NE Aerodynamics.
http://ne-aero.com/
I finished mine a month or so ago, had "Flyfalcons" test fly it a couple times for me. Flys smooth and easy. Had an engine out at about 2/3 throttle. The only way you would know it was by the sound. After a few more flights on my single trainer I'm going to give it a go.
The kit cost $155.00 shipped. The instructions are a little vague for the less experienced builder, but John Marien at NE was super about getting back to me with answers to my dumb questions. I built it straight with no changes. Even copied his color scheme.
John recommends .45s but I went with a couple of used OS .40 FPs I picked up on ebay. Ample power for a trainer. Should I get bored with this, my Duellist 2-40 should be finished. After that, I'll start on my Duellist 2-60.
Here's a pic.