I'm not sure about this one. The shape doesn't seem like it would be as comfortable as the original Steam Controller. Not enough for my fingers to grip onto. And the (right) touchpad placement is not ideal for games requiring a lot of camera control.
I appreciate the addition of a D-pad though, that was the main thing preventing the Steam Controller from being a good all-round controller.
I think the best thing honestly would have been to ditch the left touchpad and the right stick, to have a more reasonable layout that doesn't require stretching your thumb at uncomfortable angles. I have not once thought "if only the Steam Controller had a right stick", every game that uses the right stick uses it for camera control or aiming, which the touchpad is just better for, so that's the last thing they needed to add. And I never really found a use for the left touchpad. I guess it can be useful to have extra button mappings on a radial menu, in MMOs and similar that use the entire keyboard. But personally I find trying to play those games with the steam controller isn't that enjoyable anyway. It's usable, and it's a lot better than a normal controller, but the controls are just too complicated. The main reason to use controller over kb/m is convenience and comfort, and the convenience is lost when you need to memorize multiple layers, button combos and radial menus just to have everything mapped. It's the kind of thing you might try once for the novelty and go right back to kb/m. The Steam Controller is great for a lot of things, but there are only so many buttons.