Is this type RJ-45 Crimp tool any good?

[Grateful11]

I need to replace some ends and I'd like finish what the electrician left undone. I've done some reg.
electrical work but have never put ends on an ethernet cable. They have what they call an EZ end
and Crimper but man is it high. How hard is it to use the reg. tool like I have listed first.

3 Way Modular Crimping Tool $8

http://www.firefold.com/3-Way-Modular-Cr...6C383.aspx

EZ Crimper $51

http://www.firefold.com/Platinum-Tools-1...7C383.aspx

The ends are bit higher with the EZ tool too.