...Found this for 2 bucks. :) 

Of course, I bought it because I wanted to try it, so I broke the seal (Boohoo..whatever...I also opened up a factory sealed Big Nose Caveman the other day...)...I must say, although it's incredibly hard to control a lot of games with the controller...it's super fun!  Like...I can't explain it...dying a bunch of times in a row has never been more hilarious! 

If you can find one, you should get one.  However, if you're like a super 'must play perfect' type person, steer clear of it.  Of special note, I've uncovered some cool 'glitches' using it.  The best on we found was in the original Ninja Turtles (the sidescrolling one)...

If you turn the controller upside down and shake it while jumping, you actually can cause effects like morphing into an enemy or having extremely weird 'hair' garbage graphics on your head.  We also found several games where you can 'moonwalk' which is actually really useful in boss fights in some games. 

So...I think you guys should seek one out if for nothing else than a leveling out the playing field between good gamers and bad gamers while partaking in a six pack and Ducktales.  :)  Fun will be had by all...

Also, I will state that it looks like you can get some for pretty cheap.  I scored mine for $2.50.  :D

Game on.