I'm not sure about the one you're talking about but the tabletop one that SU sells is awesome! It's made by Tonic Studios, I'm not sure how many sheets you can cut at once, but I can tell you that you'll get even crisp cuts everytime! It's not one of those trimmers that you'll grow to hate after a few months. It's a little pricey but definitely worth it!!
Tonic Studios also sells the same trimmer with a full base as seen here...
http://www.acmoore.com/p-50196-guill...e-12-base.aspx
I actually recommend this one if you don't need a portable trimmer. I use both sizes but when I have to cut a lot of 12x12 paper I use the one with the full sized base. HTH!