Well the clock did not read the correct time for the longest time, as of yesterday that has been fixed. I don't have access to all of the features in there, but still can use the basic features you can use in your current radio setup. I have not kept up on the thread on here to see if there has been a fix to that. When switching in USB mode, it's not as seamless as I would like but honestly for what I paid for it, it works great. I just like the look of the interface better on the new radio. Some people have had issues with their TomTop units where it shuts off or doesn't work properly and I have never had a single issue with mine, so I guess I've been lucky. I also like the fact that the radio I bought carries a warranty. It is a bit on the expensive side, but it is what it is. I have been very happy with this unit since the day I installed it. Install was very easy and for the reverse camera alone I think the upgrade over the 4" screen is worth it, IMO.What kind of quirks are you referring too ?