I bought these glasses to use the 3D function on my TV Panasonic PF42ST30. I did not buy before because they were too expensive. I came across these compatible glasses that perform their proper function. They are synchronized immediately to the TV when it sends a 3D signal. I wear them over my glasses and it's not annoying at all. They are hard plastic which makes a little "low end" but everything is assembled and for the price I think the whole is very correct. They may be a little darker picture compared to Panasonic glasses and I must admit that I prefer to use in a dark room, I think it is the most optimal environment to enjoy these 3D glasses. Then the quality of 3D depends mostly on your TV and the movie you are watching. For my part, my plasma is one of the best in 3D rendering and I also choose my movies I watch in 3D ("five Legends" is excellent!). One criticism that can be is not to glasses: When movement of the film are very fast, the 3D rendering is a bit messy, I do not know if that happens when viewing a real Blu-ray with a good drive because for my part I look at 3D movies to MKV format and I go through a WesternDigital TV Live.
In the end I recommend these glasses do their work properly for a very good price.
