It looks like yet another controller with some special, device-specific features (advanced haptic feedback) that will only be supported by their first-party games and a few novelty ones.
> Even the older titles in the catalog and the ones which were not built with controller support. (We’ve fooled those older games into thinking they’re being played with a keyboard and mouse, but we’ve designed a gamepad that’s nothing like either one of those devices.
I wouldn't buy one before trying it.