The newer star thunderbirds are really nice. Much more workable and fly how you think they should. They are considerably softer and have a little dome to them. Highly recommended to anyone who likes how the champ thunderbirds flies, but prefers star plastic.
These sound nice. The star thunderbirds I bought from the first run were slick and very overstable. I liked the flight of the pro Thunderbirds that had a little dome but the plastic was super tacky and felt strange.