I personally dislike foam wings. I do not want to go to the hassle of sheeting one or using a cutter to make a core. I like wooden standard construction. Having said that the foam wing is very strong if done right. It is also easy to fix. Easier than traditional wood. I read here that foam tends to be a little heavyer than traditional wood. Kyosho has a rep for building a decent plane. I personally would not be afraid to buy and use one. I say use the foam and you should have no problems.

Mark Shuman