AWRC  I feel much the same - the inclusion of Livecycle Designer seems to be the primary reason for the existence of the top-end Acrobat versions, and it sounds like a technology I'd love to experiment with, but they continue to leave it out of the Mac version with no explanation - while heavily plugging its capabilities in advertising and putting "*Windows only" in teeny-tiny lettering at the bottom of the ad.

Without it, there's next to no justification for even producing any of the higher-end versions on the Mac, let alone producing them and selling them at the same price as for Windows.

While I'm sometimes puzzled why the use of Livecycle-enabled forms hasn't taken off, it'd be ironic if it was because it was primarily Mac users that found it of interest - I seem to recall that on Windows there's already a capability to do something similar in Exchange/Outlook/Office environments, so there's little motive for anybody using that to look at Livecycle. End result - lack of interest because the product is only available on a platform where it's competing with an existing solution from Microsoft, and unavailable on the platform where it might have a chance of making an impact.  
(Version 9)

AWRC  Interesting, another iApp update with an opaque comment about "compatibility".

Methinks these are 10.5.2 "pre-patches" so that when 10.5.2 is released, all the iApps continue to work smoothly.

Which suggests significant enough changes to 10.5.2 that rather a lot that of stuff that hasn't been pre-tested with 10.5.2 and patched accordingly is going to crash and burn when people upgrade.  
(Version 2.0.3)