The tablet spec comparison i've read show the pb having either the brightest or second brightest on the market today. thats why the pb perform so well in full sun. As for 10 hrs it really depend on what you are doing. Web surfing only uses 1.5 w/ hr and the pb have 17-20 w capacity. So 10 hr should be no problem. i belief the test done by various reviews peg the pb at 7.xx playing hd movies at half brightness.