Have the glasses while using only 2 times but am so far satisfied. Unlike the PTA 507 (with "breaking point") keep the bow even a scratch on the ear from without cancel the same. The picture quality is pretty much identical, the angeprisenen higher contrast I can not confirm. The eyes suffer, however, and after a film in 3D you should treat yourself or a break once a movie in 2D. This spectacle has at least one rubber-cushioned nosepiece and is therefore more comfortable to wear. Total of the purchase worthwhile because 3D is a great experience, these glasses seems to be more durable than the cheaper version.
