The crimpers are very easy to use, place the connector in the crimper, large slot for big wires and the small one for small wires, I've just checked Pololu for prices and the Crimper is $10.00 cheaper (same part)... I Like the one I bought from ElectroDragon, It works well, as well as the $89.00 Paladin crimper I borrowed. I don't know about the pin prices or the shell prices but that initial $10.00 will buy a lot of pins and shells from ElectroDragon... Pololu has a great inventory but I live on a fixed income and I am forced to do a lot of shopping I have purchased a lot from Pololu over the past 2 years and I found that I can consistently beat those prices at other stores and this one happens to be best in prices... The pins quoted from Pololu are 7.95/100 Vs 1.00/100 @ Electrodragon... seems a No Brainer to me... Just for comparison
Pololu, Male Pins http://www.pololu.com/catalog/product/1931
(1 7.95) Copied form the web page...
ElectroDragon Male Pins http://www.electrodragon.com/?product=100pcs-connector-crimps-head-series
From $0.57 ($0.67/100)
Crimper Pololu http://www.pololu.com/catalog/product/1928
( 1 34.95)
Crimper Electrodragon http://www.electrodragon.com/?product=cable-connector-clamping-tool-for-dupont-xh-2-54-etc
I bought the crimper last month for some other pins I bought from another vendor it aws a special with 10 ea of 3,4,5,6.. male header and female shells for wires with ends crimped by this crimper that worked well.
So spend your money as you will, I like to save money, means I can get more...