I have a pair and like them a lot. I originally bought them because with the other makes I always got sore skin between my thumb and forefinger which on long walks ended up as blisters. The Pacerpole handles have solved this for me, no more sore hands! What I find now is that I can press down on the handles both up and downhill, especially down, which for me is more effective than the grip style I used before. The Pacerpole grip style allows me to put more body weight onto the sticks, which I find is a better especially when its really steep and takes less body strength to do it. To be safe I always ensure that the pole sections are secure, especially on steeps descents, nothing worse than leaning on a pole to find that it starts to collapse.
The, on the flat, walking style is a bit different as well, more of a saunter really, casual and posy if you like, or you can swagger along fantasying that you are a Victorian country gent. I don't use walking sticks on the flat, unless I can't be bothered to put them away because I can see more hills up ahead. They are also good at pointing if someone asks for a direction.
Everything has a downside though, I bought the carbon fibre ones but they are still a bit heavier than other makes. The handles, when stored onto the outside of my rucksack do not look and feel neat. I have an Osprey Exos 48L bag, both poles are secured on the same side and If I do not ensure they are in the 'right' place they can touch my chin as I walk.
For me a good buy and I wouldn't want to go back to the other styles of poles.