Ive used quite a few of the available GPS apps and I can honestly say that this is the best out there in terms of usability. Some of the other competitors apps have big usability issues, and seems like clunky ports of their existing software to the iPhone. This TomTom app seems to be written from the ground up to be iPhone friendly. The issues that I have with this first version, however are: - The volume control for the voice overs doesnt work when plugged into a dock connector (like the one that you might plug into your car, for example). This makes it really annoying when youre trying to listen to some music at the same time, and then because the audio from the GPS is highly compressed (dynamic range compression), it deafens you. So youre left either listening to the whisper of music, or being deafened by the volume control. The volume control works when the dock connector is not plugged in, however. For reference, Im using a 32GB iPhone 3GS. - The font size of the readout down the bottom is too small. On some of the other GPS apps out there, the font size is nice and big and readable. - The speed limit in particular is too small. They have a a nice 32/60 km/h readout. But trying to focus in on the "60" (which is your current speed limit), is just too small. I much prefer the read out on other GPSs which have a big red speed limit sign posted on the top right of the GPS display, that also gives you a warning when youre over the speed limit. All in all, this is a great app. And it will be come my GPS of choice. I really hope they fix up these little niggly bugs. Its a little big annoying given that theyve had so many years to produce this software, but, I give them 4/5 stars until then.