Cary 211AE compared to 211FE

I currently have a pair of the Cary 211AE amps which I have had for quite an enjoyable while. I am looking at the 211 FE amps. I would like to hear if anyone had the 211 AE amps and went to the 211FE amps or was able to demo them. Was there a noticeable improvement in sound quality and did you consider the additional expense worthwhile? Is there anything that the FE’s do that was a pleasant surprise when compared to the AE’s ?