I've installed 3 now (2 on mine after cracking one), and one for my brother - all on the OPO.
Easy to do, make sure you get all the dust off the screen and you'll have no bubbles :]
And yep easy to remove, I used an Orzly one, when peeling it off I did crack the glass, but it has a plastic sheet on it too, so stays as one piece.
When I damaged mine I dropped it onto my metal belt buckle from around chest height, it would have cracked the screen for sure imo, but instead just cracked the glass protector :]