OK, I just ran into an advertisement for one of them and I was wondering if they live up to the hype.

http://www.pocketchainsaw.com/

I usually carry either a folding buck saw or a Japanese pull saw in my camping stuff, but it is getting time to replace them soon.

This pocket chainsaw thing is not real cheap
So if anybody has used one of these instead of a wire saw I would like to know if they are worth bothering with or if I am better to just buy another pull saw blade.

I would also like to know who makes the best ones of these in your opinion, if you have used them.

Thanks
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Edit: It would be nice to know if you found any disadvantages with them compared to other types of saws too.