I'm quite enjoying Pinball Arcade. It's fun and just 'feels' good to me - not that I have much real world pinball experience. Zen Pinball on the other hand immediately felt sluggish and disconnected - I find the speed of the ball unpredictable and simply feels wrong, which is odd as I enjoyed Pinball FX a lot.
On the negative side, PA is a tad buggy, has an annoying load/save system and the DLC is hit and miss: Of the sets I've tried, The Gorgar + Monster Bash set is fantastic - Gorgar is very simple but enjoyable, while Monster Bash is a lot of fun. The Black Knight and Black Lagoon tables both have a dramatic frame rate problem (feels like a CPU issue) - which makes the tables unplayable - while the other tables available are pretty good but a bit too gimmicky for my taste.
Otherwise I'd recommend it. Pity it doesn't look as nice as the console versions - but somehow it sounds better on a handheld.