What I really find annoying about most crimpers is that they're really bulky or too stiff to set the connector in the jaws with one hand. or what I have found with most of those factory style open barrel crimpers is that the connectors get stuck in them sometimes. The ones that I like the best are just the harbor freight doyle crimpers.
9-1/2 in. Wire Crimping Tool
They're small enough to get under dashboards and you can still do those open barrel crimps they just take two or three adjustments. however I am going to look into those MAC crimpers as the doyle ones cant really do the 18-22ga. stuff.
