I was a long-time WorldMate user who switched to TripIt when I went from BB to Android. In fact, I preferred WM to TripIt when I switched, I just didn't have a choice.

Would I switch back?

No, I am sharing trips with a few people in my company who travel a lot and who also use TripIt so we can see/coordinate common travel. So it would mean switching a number of people. Not worth the hassle.

Also, from what I see, WM doesn't yet support monitoring e-mails and building events automatically in Android (seems they say BB only). Which means one has to forward e-mails to WM to build the itinerary.

I like TripIt but it has its quirks and bugs, too.