I also switched from ABP to UBO, and I also feel that it does a better job out of the box and uses fewer resources, but it's a marked downturn in usability. Qui

I also switched from ABP to UBO, and I also feel that it does a better job out of the box and uses fewer resources, but it's a marked downturn in usability. Quickly blocking an element like an annoying gif is a breeze in ABP (with Element Hiding Helper), and also quickly seeing what's being blocked (CMD-Shift-V), or adding a custom rule. I have yet to figure out how to do any of those easily in UBO, and enabling advanced mode deliberately disables all mouseover help. I'm close to switching back to ABP, but we'll see...