I was completely unable to use any of the functions of Wifi, bluetooth or location servies. I would not pick up any wifi networks, any bluetooth connections would connect and disconnect a few times before never connecting again, and location services could barely pick up my location (on occation up to 50 miles away from my actual location, at closest a half mile off).
The repair was much smoother than I expected. I was apprehensive about removing so many parts, but in the end, it was not that bad, especially with the proper tools. The one thing that I was nervous about was keeping track of screws, but as long as you are careful it is not that bad. Upon removing the logic board, I was suprised to see the flex cable broken in 2 places. Was beyond happy to reboot my phone to see a full wifi signal (I was sitting about 50 feet from my router, where I normally had no signal on my phone) and to be able to get back to normal usage.
Make sure you have a method of keeping track of what screw goes where. The piece of mind is great. Also get a good tool set. I had done a few screen replacements with a set of cheap eBay screwdrivers, but decided to get the "Essential Electronics Toolkit" - beyond worth it. Also find a place with great light, as it can be hard to see, and moving while partway in may be near impossible.