(Edited to include the Horipad Ultimate) I've bought and tried the SteelSeries Nimbus, the Horipad Ultimate, and the MadCatz CTRLi. The MadCatz gamepad arrived first, and I used it for a week solid. It is a fine controller, few if any complaints. But since receiving the Nimbus, I hadn't touched the MadCatz, except to verify that I prefer the Nimbus. I sent the MadCatz back. When the Horipad Ultimate came out, I ordered it, and played with it for a while. I quite liked it, but it didn't work for me (felt too small in my largish hands), so I sent it back. Here are the objective differences I see, then below my own subjective opinions. Objective Differences Mad Catz CTRLi Has a clip to attach your iPhone Uses AA batteries (included, but BYO rechargables) Left thumbstick is above the D-pad Bluetooth 3.0 (theoretically worse latency than 4.0) Steelseries Nimbus 40h battery life Rechargable via lightning (not included) Left thumbstick is below the D-pad Bluetooth 4.0 (theoretically better latency than 3.0) Has iOS companion app for firmware updates Horipad Ultimate 80h battery life Rechargable via lightning (not included) Left thumbstick is below the D-pad Bluetooth 4.0 (theoretically better latency than 3.0) Subjective Opinions The Nimbus looks great in my opinion. Slightly behind is the Horipad (though it's beautiful too). The MadCatz looks junky. The Horipad feels more solidly built than the Nimbus, which feels way more solidly built than the Mad Catz. The Horipad feels smaller. I buy L/XL workgloves, and it feels like the thumb controls are too low for my natural grip. Even short use of the Horipad made my hands crampy. Both the Nimbus and Mad Catz fit my hand much better. For me it was #3 that was the deal-breaker. If the Horipad fit my hand, I'd have returned the Nimbus and ordered a second Horipad Ultimate. Regarding Size Revisiting my subjective opinion that the Horipad felt small in my hands... This review had nice images of both controllers. The shots were close to scale, but I had to change them up a bit. Here's a gif with the images scaled roughly the same (matched up the wood grain). Of course slight changes in distance to camera, depending on the lens, would affect this image slightly, but they were *very* close to begin with. Here's a gif with the two now-scaled roughly the same controllers aligned as closely as possible, to compare size and button layout. I lined the controllers up to where they would fit in the palm of my hand. Looking at the gif of the two aligned, I notice two things: 1. The Horipad has its buttons a little lower down, and closer to the palm of the hand than the Nimbus. 2. The Horipad is a bit smaller in overall volume than the Nimbus. Both these things line up with my subjective opinion that the Horipad felt smaller in my hand. Each user's grip will vary of course, but the Horipad's buttons are definitely further outboard, which may not feel as comfortable to users with longer thumbs. This lines up well with my subjective opinion that the controller felt small.