I have had my Cameo since Nov. 2011 and love it. Silhouette America's support is outstanding. They are patient and kind...they answered all my questions with a smile. Love the online store!! I do use their mats now...when I had the first Silhouette I did buy Cricut mats. I think the blade life depends on the kind of material you will be using. If it's just regular cardstock they last a very long time, but glitter paper and things like that will definitely dull a blade quicker.
What I love is that Silhouette has a few really good "stock up" sales through out the year and that's when I buy more mats and blades.
Here is their support page info for tutorials, etc.
http://www.silhouetteamerica.com/resources
It is very basic to set up, if you know how to use a computer then working with their software is easy (it comes with 50 images, if memory serves me right) so you can cut within minutes of setting it up.
Make sure you join the yahoo group silhouetteusers. One of the gals has a youtube channel and she makes everything super easy to understand...her youtube name is cleversomeday.
hth
Kathy