Ya those rolling machines are nice. We used one to actually roll a blunt the other day.. lol!
A couple of cons though:
The problem to me is that it packs the weed to much in the paper to smoke propally. For me it just doesn't get enough air circuilation unless you huff on it. Could just be me though (or we packed to much chronic in--lol like you can never pack enough chronic

)
Plus another draw back of the rolling machine is that it is another piece of "hardware" for your stonerism that you have to carry around.
Yet its pros are awesome--it rolls nice j's, compact weed---can fit a lot in a joint using a rolling machine, and its a great size/look/shape.
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--pz--