Big Shot or Big Shot Pro

Well I've made several purchases in the last few months to support/enable my paper crafting.  One tool that I do not have is an embossing/die cutting machine.  I've looked at several and seem to have narrowed it down to the Sizzix models.  BUT I'm not sure which model I prefer -  the heavy duty Big Shot Pro or the Big Shot. 

What do you have or what are your thoughts?