Not the best by any means, but you can spend $200, $400, and more. I have used these Vaco crimpers for many years, for both professional and personal work and have never had a bad crimp. And the handles are nicely padded which is great if you are going to spend hours crimping.
What I look for in an inexpensive crimper for the un-insulated wire terminals is the type of jaw that these have.
In this closeup you can see the bottom jaw in the photo is where the split side of the connector goes. It fits closely and prevents that seam from opening. The top jaw pushes the metal of the connector into the wire exactly enough to create a gas tight joint so it will not pull out or corrode. There are more expensive tools and dies that make a different style of crimp, but these have worked for many thousands of connectors for me.
Another thing that I look for in any crimping tool is a positive stop. A positive stop tells you that enough pressure has been applied but it also prevents you from applying too much. If the pressure is too little, the wire can just pull out. If the pressure is too much, then the wire will be crushed too far and it can and often does then break at the point where the crimp starts. The correct pressure is a must and this tool tells you that when the rear-most point of the jaws, near the soft plastic handles, comes together with a click.
It has been a while since I purchased them, but I believe they were about $20 or $25 back then. Several, perhaps many companies make similar ones. I like to stick to the known, name brands, not the unknown imports.
Vaco is a good brand. After 30 or more years of use, mine have a slightly loose rivet holding the halves together. This is probably more due to my using them to cut small screws to length than for their use in crimping. They still work well for both these purposes. The wire stripper section never was any good and has become almost totally useless with this wear. The tool of this type of construction with the best wire stripper I have is by AMP. Mine is about 40+ years old and will still strip solid wire - not so much with stranded. But then, I have multiple wire strippers which I usually use.
Other good brands include: 3M, AMP, Amphenol, Belden, Cinch, Greenlee, ITT, Klein, Molex, Switchcraft, Weidmuller, and more. Stay away from obvious Chicom or unknown or house brand tools in local hardware stores or unknown, internet sellers. And I do not know if all of the above companies make this style of tool. Good places to purchase them would be McMaster, Grainger, DigiKey, Mouser, Newark, and other electronic suppliers.