RE: Great Planes Extra 330L
"R/C Report" published a product test on this kit in the February 2001 issue. It is by Dick Pettit and very complete. If you can find a copy it will be worth looking at.
The "Cheers" were: "Great plans and instructions; good quality materials; nicely done fiberglass cowl and wheel pants; quick and easy to build; excellent flight characteristics.
The "Jeers" were: "Minimal hardware; several discrepancies in parts cutting instructions; wing area less than indicated, they measured it at 1607.25 sq. in; wing and tail bolts may loosen after several flights.
The summation was - he really like the plane.