Found a few niggles so far:
the fiat 500 Abarth literally does a stoppy when you jump in the breaks, it's hilarious
Using the paddles on the wheel which are actually R1 and L1 buttons, don't actually work as L and R buttons to shift the next page in dealerships for example
The knocking down cones task thing is bloody impossible to get gold and the AI still needs some work to stop them from turning in on you.
I thought the whole thing was rediculously slow at loading at first, but it appears once you've loaded it once, it's 10x faster next time
One awesome addition is being able to fit BBKs, it's just shame you can't colour code them, but atleast when you win a car you can select the colour instead of being given boring blues and reds all the time
Lastly there still isn't enough customisation for the cars. Fair enough the only car I've tried added aero too in the HR Zed, but the kit is the exact same one and only one available in GT5, but there are about 7-8 wings available and we can now also add a full underbody kit to aid aero