Using Panasonic BDscopes since 2009 (BW500 / BWT720 / BWT745), after testing several models of different brands (Verbatim / Sony / LG / Mediarange / Panasonic), now I no longer use these Panasonic. For if despite very good storage conditions, I quickly encountered problems with the LG BD-RE and BD-R or two Mediarange. Verbatim, Sony and Panasonic have never shown the slightest sign of weakness. However, as in recent years, prices are at a few cents nearly as much buy those that have achieved the best results in tests that had been conducted for the benefit of official bodies of some conservation programs (INA) or archives.