I haven't seemed to have any issue with wifi on any of the releases so far. It might be a little less strength, but I never have issues with it not connecting or randomly disconnecting that I know off.
The only issue I have is with bluetooth. With the Sony rom I would leave bluetooth on all the time, when I got in my car and turned the car on the radio would connect up. With the latest M1 release I have to turn off bluetooth and turn it back on for it to connect. I started first on the 10/30 CM build and that one seemed to work fine. I moved from there to M1 and that's when I noticed the bluetooth issue.
The latest experimental version I think is only to add the 3g signal bar fix?
That's the only visual thing I can see in the update. I now get the LTE bars properly. I will test my bluetooth switching to my car from my Sony bluetooth device and see if the same happens to me.