And that is the problem with the current legal environment.
EDIT: Interestingly enough for me, I found it kind of repulsive that King.com trademarked "Candy" but I don't find this repulsive (I guess because either I am a hypocrite, or because "Paper" is their entire product name).
I hope not. It's much nicer than the official Facebook app. I think they ought to replace the official client with it.
I hate 'Top Stories'. If I followed/friended you, I want to see what you have to say. If I think it's to much I'll suffer, or unfollow/unfriend. 'Most Recent' preserves order, and timing. Many of my friends post in such a way that timing, especially in relation to earlier posts, is important, 'Top Stories' doesn't preserve that.
As far as it's 'News' stuff, I still use rss. I already curate content I am interested in. I have spent a fair bit of time (across time, not all at once) curating my feeds. All of that to say, It didn't appeal to me.
A lawsuit on the other hand would burn through cash, but IANAL so I don't know if the damages they could extract from Facebook would be worth it. Maybe being in a lawsuit against goliath would make the lawsuit pay for itself as free advertising, since I reckon journalists will enjoy writing about such a case.