the problem with the OG Steam controller were the weird choices made in terms of what controls to put on the front side. People expected dual analog sticks and a D-pad, but they got a single analog stick and two touchpads, one pretending to be a D-pad. The touchpads were nice when you wanted to do things that were meant to be done with a mouse, but using them for anything that was meant to be an analog stick or God forbid a D-pad was annoying at best and non-functional at worst.
I own an OG Steam Controller and I do actually enjoy using it for some games. The new one fixes every problem or annoyance I've ever had with it, including the lack of a built in rechargeable battery, and the incompatibility with controller mappings meant for the Steam Deck. Whether it's ultimately worth it depends a whole lot on price, but it is absolutely a step up from the first Steam Controller.