Perhaps for psychological reasons ZEE issued the 109 and Zero as air racers. That way they aren't "evil" or "bad" airplanes. The "black" 109 was labeled as "Good Goose" in it's air racing scheme. It was only in 1993 that the 109 would appear in warpaint.
For a cheap little line, the issue variations and time frame can be very intriguing!

The obviously went early into international distribution as I've seen packaging for every Continent except South America. If their intent was to overthrown Sky Busters, I suppose they were successful, but only because of their very low cost. They did become ubiquitous over time and only in the last decade have the filtered into the "generic" categories.
If they had continued with new pieces of better quality, and tried to penetrate those markets, they might still be around. Their final buyer, Red Box Toys, did that with larger planes and a more limited distribution - and higher prices. I don't think they are out of business, but they certainly maintain a low profile. With the closings of so many hobby and toy stores, and the almost elimination of such items for sale at grocery and drug shoppes, they are finally finding a home as cheap "collectibles" at many aviation related venues.
It's a fun line to collect, and like that A100, the basic cast isn't half bad - I've turned a number into little "models" by redoing the cast, painting and then decalling them.
Michael