After a shaky start, Nintendo is doing all it can to turn its 3DS into a success. The Kyoto-based company has reduced the price of the system and improved the software lineup, but you'd think that the controls at least would have to stay the same for a while... right? Wrong. Nintendo's pushing back hard against Sony's hardcore dual-analog PlayStation Vita this week with the Circle Pad Pro: an inexpensive (1,500 yen, or $19.99 in the U.S.), jury-rigged attachment that outfits the 3DS with a second analog slider and two more shoulder buttons. It comes out in the U.S. on February 7th but launched in Japan a few days ago alongside Monster Hunter 3 (tri-) G, and we've put both the peripheral and the game through their paces. Is it an essential accessory for 3DS owners, or are we looking at another Power Glove? Let's find out.