At least QNX is a fairly good bit of software. One drawback I ran into with 4.* was that its browser wasn't particularly fast and it doesn't collate events, so if you, say, hold down "down arrow" to scroll down, it'd get spammed with "scroll down" events, each one of which it would duly execute... very... slowly. Well, in comparison to the rate the OS receives events. The browser should instead eat the queue and transform twenty consecutive "scroll down one" events into one "scroll down twenty" event and execute that. Because, being a RTOS, QNX is REALLY good at quickly taking events and queueing them for applications to deal with.
It feels like a bit of overkill though. But it'd beat anything from redmond any day, so it's all for a good cause. Now if only RIM would come up with sensible email server software integration.