Best place to buy custom controllers?

[Acid.]

I've found a few websites but out of experience which one do you guys think is the best and why? Quality, fast shipping, can last lots of play time ect. I need one because I am going to head to my first tournament with my cousin. I main falco he mains mario.

 

[Onmitsu]

Gcs customs did a great job with mine, and it didn't even take that long. Less than a month actually.