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The good... The mylar acts like one-way glass when light is shown on one side which is cool if you are using this as walls for a grow tent.
The bad... The reflective coating rubs off with cleaning and/or light abbrassion (like a wet cloth) leaving just clear Mylar which is absolutely useless. Fortunately the reflective coating is only on one side so make sure whatever you are using them on, the side that can be stripped in not the side you will be cleaning often. Fortunately this stuff is so cheap it's not a big deal but still a pain in the butt because you will have to replace it often.