I'm with Rick on this one, but totally concede upfront that my lifestyle/expectations are out of sync with today's instant, need-it-now mindset. I suspect my 19-year-old stepdaughter might argue with me on this, so please keep that in mind.
Anyway, the problem that Tismeinaz started this thread with and later added to is a legitimate function of expectation, i.e. MM should sync properly between devices/apps rather than create a Twilight Zone weirdness that needs troubleshooting. But so much of the criticism that I've been reading about MM's push (primarily outside of MacOSG) focuses on the expectation that the "Cloud" will sync all data instantly, which I find, frankly, an unreasonable expectation.
For me, the real advantage of MM's push is that I receive my email significantly faster than I used to. Sure, I wish I could push both of my current .Mac/MM email accounts - all of my accounts, actually - but so far, the one MM account I push has proven almost instantaneous vs. the every 15 minutes it once took to fetch those messages before MM/OS 2.0. (I guess I'm not totally patient...) But email is something I don't generate so, of course, I'd like to get it a.s.a.p.
But if I update a contact or iCal entry, do I really need that update instantly pushed to all of my other devices? That would be cool, no doubt, but at 42, I think my memory's still good enough to remember the change I just entered and deal with it for the time it takes for the Cloud to spread it around.
Just adding my two cents to this interesting thread but for me, the new MM push is working great!