Ah I think I've figured out why some people were saying it doesn't work. Wii speak SHOULD work fine with either rev12 or rev13, but I noticed after updating to rev13a that it didn't turn on anymore when I went in a random match.
Then I realized that the only reason it originally turned on in the first random room I was in was because a friend that I registered also was in the same room.
I believe Wii speak will only let you chat with people in the room that you have added on your friend list.
That being said I think rev13a works better than 12 with the conduit as rev12 seems to cause some really long freezing in wifi menu's, which isn't nearly as bad with rev13a.
Edit: And the problem with the above post is that rev8 won't work with usb loaders, rev9 and rev10 both make any other usb device besides the HDD you run games off of stop working so they shouldn't work ever.