I have been a gamer since the days of Pong so I prefer tactile controls. Having recently picked up a tablet and having read reviews for the Modern Combat series, my search was on for a simple, inexpensive, and on the go controller.
I picked this D pad up along with Second Shells version. Both pads arrived today and I immediately bought Modern Combat 3 and tried out both pads.
Each pad has its merits and downfalls and both pads worked fine and did what they said they would.
The Logitech pad is larger and has larger suction cups (although both pads stuck very well), it has more resistance when moving the D pad button around, and the D pad button re-centers more quickly and accurately than the Second Shells version. The Logitech pad comes with a pouch.
The Second Shells pad is smaller, has less resistance when moving the D pad button, and centers slightly slower than Logitech's version. The Second Shell's version comes with two awesome buttons as well.
Besides the extra pack ins with each pad, the major difference between the pads is the "springs". On the Logitech pad, they are rigid plastic, on the Second Shell's pad they are rubber. It appears that the rigid plastic springs of the Logitech's pad would break more easily but because they are more rigid, they feel more like you are moving an analog stick and they re-center more quickly and accurately than the Second Shells pad.
I think it is best to pick up both brands at the same time, as I did, to get the best of both worlds - 2 D pads for games with dual on screen D pads, two degrees of resistance and re-centering, 2 buttons, and a pouch.
Those that did not give this device a positive review may be trying to use it for games that do not have a circular, analog, type D pad on screen. for example, I have seen some games that have more of a + sign D pad in them and this may not work as well with those types of games.
Now that I am using the both pads, I really can not imagine playing without them and both pads are much better than I ever expected. Each has its own merits.