well... DON'T DO IT... my 655 is now working like hell now with v1.37... as so many other reviews... Not only I cannot obtain 300mbps no more (which I used to have on my hp laptop when set at 40MHz), my S4 wifi did not stabilized either and always report un-reliable connection. Even worst, I lose internet connections now every couple hours which NEVER happend before...
Suddenly, no internet. When I go on my wifi status on my laptop, I am connected to the network but no internet. When I login the router, I see no internet connection in the router status. I need to power down the router in order to regain internet access as a release/renew internet connection never work.
Now I can't rely on that router anymore. I just made the worst decision in so many years (I think 7 years of flawless operation) but now I get an unstable device that did not fix the issue of my S4.
Worst decision I ever took on a hardware device... DON'T DO IT, stay with your old firmwares.