Switching Travel Assist on always sets the speed to the current speed, regardless of the speed limit of the zone you're currently in. Without going to the car and looking through the settings, I don't know the exact name but there's a setting that will auto-adjust your TA speed in line with the speed limit when passing signs.
For me, TA is quite good but I am finding it freaks out at times. As Fred said, it will very occasionally randomly drop to 30mph for seemingly no reason. I felt as though it was maybe seeing a 30 sign when passing a short off-slip or something, but I am not sure. This happened during the night with no roadworks and little traffic, so I don't think it's a Car2X thing in my case. Regardless, I never want to have the feeling that things are out of my control and so the car all of a sudden braking whilst cruising at 70 on a motorway is definitely not to my liking.
I also feel like using TA is going to make me a lazy driver, as I don't need to concentrate quite as much, so I will still use it every now and then - when I need to fiddle with the screen or take my sunglasses out of their bag, for example - but, for the most part, I will just stick to popping Lane Assist on when cruising.
