I have upgraded to a 5s but I have several accessories that connect with the 4s including my withings blood pressure cuff and romo robot. I wished to continue using my 4s with these.
The repair went well. I have some experience with electronics and repair. The instructions were very well documented and the images were very helpful in completing the repair without damaging other components. I am very happy that I found ifixit and their tools, parts, and instructions. I could have gotten the part for less but the tool list and instructions made it worth paying a little extra.
I did have trouble with the Philips screw driver I bought from the required tools list. The head of the screw driver was too small for the screws on the iPhone. I used another that I had but the shaft if that screw driver was very nearly too big. Additionally I needed a magnifying glass and bright light to aid in the repair.