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You can buy cheaper versions of this but believe it when I say there’s a big difference in quality, I’ve tried a cheap one and it left smudges and black particles everywhere. This one cleans perfect with no problems. You get what you pay for in this case.
I bought this after several recommendations on one of the forums I am a member of, whilst it does a good job on the eyepieces I feel that the brush doesn't do a lot? I suppose it needs to be gentle to make sure it doesn't scratch the lens, but I was expecting this to be a little bit more effective.
This doesn't take away from the fact that it works great, but I think that the brush is a little on the weak side.