The end that attaches to the GameCube has a very nice fit, so there should be no worries about it suddenly popping out in the middle of a game. The end that attaches to the top of the GBA is also tight, especially with the two clamps that hold it into place. Not that I'm suggesting you walk around the house swinging your GBA around on the cord like a mace, but the connection is tight enough that when it's on, it's not going anywhere. As far as the actual in-game performance goes, the
Advance Link works. Data transfer was good, and I never experienced many problems, however since I really have nothing to compare it to, I cannot comment on speed. The cord got the job done, so what more could I ask for?
I am eternally grateful to Nyko for including instructions on how to use the device on the back of the box. To some people, just linking the two systems together might be a no-brainer, but it is still nice to have.