The offset is handy for connecting different brands of pedals. It won't be enough for some, but if the difference in height is just a cm or so, it's perfect. And having one less cable in the set up is always welcome. I don't see any downside to this, and I plan to get some more so I can get rid of the 6" cables that clutter my pedal board.
Highly recommended, the offset allows some adjument of the alignment in two pedals. Since not all pedal connections have the same height the offset gives you some room for any misalignment by rotating the barrelof the adapter. This adapter will place your pedals closer together & it makes your board look neater.
I have used these on my pedalboard for years and they never let me down. Thankfully they made ones for different input and output heights. Now you can have one going from say a Boss pedal into an MXR pedal. For years I would have to replace cables every other year (not anymore!!!!).
I bought 3 of these to make my pedals a bit more orderly. Although they worked fine the first time I plugged them in, two of them just came completely apart when I unplugged them. They might work better with jacks that hold the plugs less tightly (Neutrik type rather than Switchcraft type), but don't use them with Switchcraft type jacks if you ever plan on unplugging them. Spend the dough on a pedalboard wiring kit from George L's or Lava Cable and you'll be way happier.