Since Apple announced MFi controller support for iOS games, fewer options appeared than originally anticipated. The reason for a slow response is a bit surprising. However, my point of view is slightly skewed as an iOS accessory hardware reviewer. Still, I cannot imagine why app developers would not want to build in the support. Even more shocking is the small list of hardware options.
At CES 2014, it seemed like controllers would be the new thing. Unfortunately, several companies I chatted with never released their controller. We have come a long way since January 2014 and a full year plus another six months since the MFi controller support protocol released at WWDC.
SteelSeries was one of the first companies to-market with their SteelSeries Stratus. The Stratus was an extremely small MFi controller, but perfect for on-the-go gamers. Recently, they released the Stratus XL, a full sized battle tested design, similar to a true console handheld. After settling down with the XL, it changed the way I look at iOS as a gaming platform.