Play right uses browser projects. So with play right, you are not testing gouge crow. You are literally testing the chromium projects. It's a more pure, strip down essence of the rendering and gin jabs or stuff like that. But i would also can out they may not be usable in all contests. Some legacy shops have very strict requirements on brousers and virgins to test. They're crummy share point installation from ten years ago. Any thing like that may be a show stopper for folks who want to use play.