But like Famicom controllers, I hate that the wire is coming out the side of the controller instead of the top like normal. I did a Google image search and it seems like some SMS controllers have the wire coming out of the top, and some out of the side. Well, it's definitely uncomfortable coming out of the side! Luckily, it's a really easy fix if you have a drill press.
Here's the original controller, with the wire coming out of the side...

Now here's the wire coming out of a new hole that I drilled on the top of the controller...


For the second controller, I realized that I could make better use of the strain relief posts if I drill the new hole more toward the center...

Here's how I jigged it up for the drill press...

And I used a countersink bit to get a nicer looking hole...


You might be able to do this with a hand drill if you're careful enough.
Now, let me see if that D-pad is as bad as everyone says it is!