It may seem expensive for what it is when it arrives.  You will soon find how invaluable it can be.
I have recovered it's price in restoring scrapped powerpole ends that I had dumped in the bottom of my toolbox.  With that said, I have 9 solar powered radio sites where I've had to make 31 powerpole ends for each location.  Occasionally there has been an intermittent power failure.  With extensive troubleshooting I'd find an incomplete assembly of a connector (my fault).
With this little tool I have been able to go back and quickly double check my work, catching a few more of my errors, preventing a greater failure in the time of need.
This little tool makes it a quick and easy fix.

For smaller wires, this works much better than poking with small screwdrivers.  Just use the hooked ends as a pusher to reach past the wire and push on the end of the crimp until it seats.  For very small wires, the tool can cradle right around the wire for a great pushing angle.  Big fat wires (10ga, 12ga, etc.) are stiff enough to just use the wire to push the connector into the housing.  No tool necessary.

It's a tad expensive for what it actually is (a piece of folded spring steel slid into a yellow rubber cap), but it works well.

Where it falls a little short is disassembling connectors.  I can't blame the tool very much, since there really isn't a better shape that would get into the very tight space to release the spring.  It works adequately for this, but always requires a bit of tinkering to make it happen.  Probably as good as it gets for this, and definitely way better than nothing!