I have the cutter and the set of block templates. Here's a link to what I purchased on HSN:
http://crafts-sewing.hsn.com/martell...09400&ocm=sekw|best_sellers
I love the block and circle templates. They are very easy to use. I have not tried them with my other rotary cutters, just with the Martelli.
As to the cutter, I agree with what has been said above - there is a definite learning curve. You hold the Martelli cutter in a totally different way than other brands. Your fingers are in kind of a different configuration.. hard to explain. The little spring that closes the cutter was broken when I received mine, but they have plenty of videos on their website, incuding one that shows how to put the spring back on. So far, it has held up well. I don't own either their rulers or cutting mats, so I can't give any opinion on those.