I got onand have used it a couple of times, although of all the times I've used it its come out right only twice I think. I cant really afford to buy a load more cartridges at the moment so I dont have a massive variety and like other people said it takes practice to master it (i'm nowhere near there) its one of those things that I always mean to have a play with and get used to it properly and I never seem to get round to it! My problem is that I cant get the fondant/gumpaste to stick that well while its cutting. It seems to be stuck really well, then as soon as the blade goes through it it comes unstuck. I do have to say though I like it in theory if that makes sense. I like it, I just need to learn how to use it before I can get wonderful results from it!
I paid about £210 for mine in the UK, I saw lots of cheaper ones on ebay though at the time, and mini ones for about $50 I think, I dont know if they are still on there though.