[fnordsensei]

I wouldn't say I can't stand it (indeed, I am using it), but I've had problems with it. Disappearing messages and the like: being contacted via another medium by a person, asking why I hadn't responded, with no record of there ever being a message on my end.

It's OK in my books: a symptom of there being no server to step in and enforce a universal truth. You just have to understand what you're getting in exchange for the occasional inconveniences.