Have flown 6 Flair Triplanes over the last 15 years - they are wonderful to fly when correctly set up - mixing ailerons and rudder certainly makes smooth flying easier. A wonderful dogfighter and can out turn any SE5's or Sopwith Pups I have ever come across.
The cardinal rule is to always land and take-off directly into wind - once out of wind there is little way back.
Certainly some scope for scale improvement - my current one ( with gold stripe in the picture) has some minor improvements but is basically as per the kit.
My mates DR1 ( the red one in the photo) is lovely and is much modified from the Flair kit.
No experience of Balsa USA version I'm afraid.
VBR
Jason