The wiikey doesn't have a disable feature, so it always on when you inserted disc even original. I don't know why you want to get a wiikey? the wiikey to me is the worst chip to get, because it currently still have gamecube audio problem, while all other modchip worked fine. Besides, every modchips can do the same and even have disable feature and no gamecube problem, it can all be update too unless you get a very old model.
The cyclowiz is better than the wiikey, at least it have a disable feature and gamecube audiofix, except for bloody roar primal fury, it freezed after the character selected screen, and if you don't mind a switch sticking out of the wii. But if you want the wii to looked like it haven't been touched and no problem with Bloody Roar then goes with the wiinja deluxe, it can do everything, it even have dvd updated feature. It like the cyclowiz but without the switch. But whatever you choose it still better than the wiikey at least that my opinion. The wiikey possibly won't have a bright future because of the lack of disable feature, it mostly likely be the one to get banned first if nintendo really serious. For installing, well try to looked for picture of how the installed goes, maybe that will give you a idea.