I never thought about trying a multi-piece system for a blender, but I’m glad I did.  I love that it has two different sizes of canisters (is that what they’re called?) and two cup sized ones.  Plus multiple blades to use for the different things you can do with it.  Chop veggies, make shakes/smoothies, and even dough.  I haven’t tried that last one yet but am really looking forward to it.  Totally worth it!