It is expensive, but I recommend this to a friend of a bike charity shop, just to purchase high? It is very easy to use. It is easy to position and do not need to worry. The cheap chain cutter for bikes had to go quite carefully, such as positioning. This can be done in one shot. If you plan to use it several times surely recommend this one.
There were also cheap and easy to use, but I bought it with a secure Shimano. I can not compare because I have never compared with others, but I can use it normally. Just keep pulling the chain but it seems to be enjoyable if there is one more arm (laugh)