I've used these on beginner via ferrata in the Dolomites. They immediately make me feel more secure and would recommend them. The stretchy lanyard is a plus however it proved a little too short for some of the situations I found myself in. I'd still prefer these over 2 longer lengths of rope and a pair of VF carabiners combined. There is comfort in knowing that the kit has inbuilt shock absorbancy should a big fall happen.
the carabiners are large and slide along the steel very easily. The snap-gates are easy and not tiring to use. The kit is also fairly light.