Son in law got a similar tool, while it does take less effort some to cut some larger limbs. The additional size weight of the head is a big disadvantage if you have much real work to. Put a one pound weight on the end of your regular pruner, then carry it around for a while. The addition head size prevents you from pruning close to the trunk, which leave a stub which it difficult to heal.

As with many tools, it might have it's place, but buyer beware.