Best chess apps for the endgame

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I'm assuming that none of these iOS apps will be looking that many moves ahead etc so getting a reasonably challenging endgame (on the iPad/iPhone) is going to be a matter of technique (or rather superior programming) but I've noticed that some chess apps are much better than others in the endgame. 

tChess Pro could definitely do with some work in this area.  Shredder seems to be good and I've also rediscovered Chess Genius, which also good.  I quite like Chess Genius's "next best move" where you can ask the computer to play what it thought was the next strongest move instead, great for nudging into other variations that you want to play through.  

Was wondering what experiences others have had with the various apps/engines on the iPad/iPhone out there.  I know everyone’s probably got their favourite, how does it stack up in the endgame?