I looked what machine it is and found their website, it's
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it has complete video instructions. Personally I'd go no where near it, if it were cheaper, maybe, but it's basically the machinery, with none of the gizmos, you do rib by undoing half the stitches and redoing them by hand!
Watch the videos and see if it does the things you want.
It doesn't need the yarn to be on a cone, which means you are having to feed it yourself. It would be good to try how that felt, I'm imagining trying to use a sewing machine whilst holding the top thread in one hand!
Did you see this article
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I can see that this would suit some people, but for me, this one has too big needles, it's a bulky weight machine and it's definitely for things that are mostly stocking stitch. It might be just right if you are wanting to do afghans as if I'm understanding it right, it extends easily, though obviously that adds to the cost. I bet there is a yahoogroup, maybe you could join one of those and lurk for a while and see if the kind of things people are doing are the kind of things you want to do.
Cheers Anne