I had a 2003 Rubicon with the 4.0L inline six. I never had an issue with that vehicle. That engine was bomb proof and reliable as hell. There also was not a lot of complicated technology installed in that vehicle as well. Cant speak to the newer ones as I have not owned one.
However, Fords...
I had one of the molded plastic hard tops for my '03 Rubicon. I did not have any issues with fading, If the Bronco MIC is anything like it I would say it should hold up fine.