i used the kyokugen lugnuts for 2 years. i know a lot of people have had problems with the key stripping. i personally had NO problems with the key. the only thing that worried me was that the key always stuck to the lugnuts after taking/putting them on/off. they are a pretty decent lugnut for a good price.
i recently moved over to the McGuard Splinedrives b/c they were closed ended lugs and had a steel key and rotating base.