My 2.4 is not noisy at all.
I feel it was worth it as I’m scoring up to over 1300 single core on Geekbench, and looking at the charts I’m even beating the new Mac pros in some cases. Single core performance is important for audio production so I’m considering that an important benchmark for me. The computer does not get noisy unless the cpu is at full load, and even then it is not that loud to me, my 2016 and 2011 MBPs are both louder at full throttle.
I have read about some people having problems with excessive fan noise so I do believe that’s a problem but I don’t believe it’s the 2.4 cpu that is the problem. In fact a lot of the complaints have been from i7 owners.