Which one did you order?
I needed to crimp of a car stereo harness yesterday so I picked up a set of these (this place has good prices and is conveniently a couple miles away for will call pick ups): Titan crimpers they worked nicely. Good crimps w/o having the really squeeze down on the hold cheapies (also far less chance of gouging out the insulation). As far as I could tell you still do only one side at a time even though it looks like you might be able to do both (doesn't get a good crimp if you try it), so you get a double crimp on both sides.
That set is for insulated terminals and works good on those. Now I'm curious what is the right tool for crimping these seamless non-insulated butt connectors: Splices This tool doesn't work for them (does good on the insulated as mentioned), I'd like to try these out with heat shrink for sheathing.