last night I was able to compare the two side by side, one with the stock cable and one with UE custom cable(pre 09/01/10). I have read countless threads, and I think all agree that it's a tight fit and not meant for Tf10, but curiosity got the best of me and decided to go ahead and try anyway.
1. First of all, for those who have a hard time removing/attaching any cable connected to the Tf10, I have found out that you should do it at a slight angle. I myself have had a hard time doing this in the past, not to mention people using pliers or some breaking the pins inside the connector.
2. I did cut the pins on the ue custom cable for a better/flush fit.
3. As for the sound, I used my Rocoo P dap connected to my Pyle phE7ab (aka Fiio E7) since it has two side by side headphone jacks, and to my ears they sounded exactly the same.
...Same sound, same volume...For some reason I was expecting for the sound quality to drop a bit (must of read it in another thread) with the ue custom cable, but no such thing
I guess it's comforting to know that the cable I will be using with my reshelled Tf10(ue custom cable) should not change the sound of the Tf10(at least not the cable)