If your foam wings are coming apart your not building foam wings correctly. My first Partner with foam wings had over 1000 flights on it and the wings were like new. The Onas I am flying now has about 700 flights with no problems with the wings. I also have to agree that top hinged surfaces at least on the ailerons are not the best. You can make them work OK but center hinging will roll better. It's also pretty easy to seal any hingeline. The composite wings Chip is producing seem a good way to go but I have yet to fly one.

I can see why manufacturers want to develop composite wings. It's very difficult to obtain the right balsa to make a proper wood wing.