No joke, I would switch to Android in a hear beat if they don't. I am 100% reliant on my map app and therefore am willing to pay for anything with the best experience.
Less responsive updates (I've gotten things personally corrected on Google maps in 3 days or less, while as of 2012, one of the streets in my hometown on TT is STILL wrong despite this being reported multiple times more than five freaking years ago), very high resource usage (phone seems to slow way down if TT is open or backgrounded), it also uses a ton of your storage memory for map data, and doesn't have the same amount of addon data (street view, reviews, that kind of thing) as Google.
And you have to shell out $50 for it, last I checked.
Android's google maps have been better by features than iOS's google maps for a couple years now, since Google could update the Android app. Vector graphics since 2010, local integration (reviews, including zagat now), more advanced directions options, and so on.