It is easy to fly and, as with all SIG kits, a high qaulity kit with great instructions.
I didn't build one myself, my neighbor did, but it sure is a nice plane.
I can't comment alot on ARF Bipes, I own 2.
I can say the the Modeltech SE5 is a gentle flyer and quite alot of fun.
I also own a Great Planes Super Stearman with a Zenoah G26 engine but I wouldn't recommend it as a first bipe.