The scissors work fantastically well but if you're reading this away to purchase these bonsai scissors I will give you 2 bits of advice.
They have started to rust BUT thats due to my stupidity of getting them wet when I was watering my chinese elm (ulmus parvifolia) so keep them away from water. But if you're pruning a cotoneaster you will need to rinse the bonsai scissors as the cotoneaster contains a toxin that is harmful to other species, no problems will be had if you keep these especially for a cotoneaster and keep them far away from any other plant / tree / vegetable.
Speaking of keeping them away from living things, of all the sharp objects to keep out of reach of children these are especially one sharp object that must be kept away because they are really, really sharp. Having said that though this is a good thing for pruning, nothing is worse than blunt tools and you could actually damage your bonsai if blunt tools are used so keep them sharp whenever you need to use them.