Like anything we do purchasing a tool is fine but you need to spend some time learning how to use it, it doesn’t matter if it is a new carbine or a forcible entry tool like a halligan.
As numerous guys have already stated go with a one piece forged design, with the pinned models you are placing a ton of force on a small pin and I have seen them fail.
If you carry a halligan you need to carry a striking implement as well, a sledge hammer is a great option but depending on your needs a flat-head axe can be more versatile. Another option to consider is a rock hammer or dead-blow hammer that can be used one handed. Some non-fire agencies are issuing these as a striking implement and while I was skeptical at first they do impart the required force to the halligan and can be easier for guys to use when they dont do this very often.
Remember a halligan in most all applications is a two-piece, two-person implement and it requires the two operators to have at least a basic idea of whats going on to be used safely and effectively. Most entry ways are somewhat confined once you start trying to get two guys and two tools in place, and you are handing your backup officer or partner a 30" long piece of wood with a 6-20lb. steel weight on the end of it and asking him/her to bang it into a 2"x2" piece of steel next to your hand while he is thinking of the tactical problems he is likely to encounter upon forcing the door. At the very least it may take an inexperienced user a few extra strikes to properly set the halligan, too shallow and you don’t generate the requisite mechanical advantage, too deep and the angle is wrong and the tool might get stuck. Worst case your hyped up partner who hasn’t really swung a sledgehammer since helping his old man renovate their master-bath the summer he graduated high school misjudges his swing and now your primary gun hand doesn’t work with an entire structure to clear. Only you can decide if your partner is qualified to swing a sledgehammer at you, if it concerns you maybe a shorter more controllable option would be one of the short handled rock hammers or dead-blow hammers.
That scenario might seem slightly melodramatic but it bears thought. Stop by the local fire station (one of them is their “training station” and is likely to have a forcible entry training prop) get them to go over the tool and its proper use with you, or at the very least get on youtube (just remember you can learn as much about forcible entry on youtube as you can about shooting and everyones content is the same quality as a video by Magpul Dynamics or LAV right?) although little of what you will find will be law enforcement focused.
There are 4 basic operating surfaces of the Halligan and each has its own use and specific application. Learn these, once you have learned those you will need to learn some very basic building construction to understand the proper use. At its most basic level you will have two evolutions that you need to know as a law enforcement officer, anything more and you should probably cover the firefighters as they force the door for you.
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Inward-Swinging Residential Door using the Fork
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Inward-Swinging Residential Door using the Adze/Pike end striking surface as an improvised battering ram
The benefit of Option #1 is it is somewhat more likely to allow for re-securing the door post-entry, and that it is more likely to work 100% of the time.
Option #2 only requires one tool and person, can be slightly faster if you don’t have a fairly well trained entry team, is adequate for many residential doors including apartments with wooden frames surround a metal door, usually only takes 1-3 strikes, and requires the least amount of training.
Just some thoughts. I am partial to the 30" Pro-Bar, I find that I like the shape and size of its surfaces the best especially with some minor modifications. That being said like anything I also tend prefer higher end weapons which doesn’t mean that other weapons are not useable. If this is something you might use once a year you might save some money and get the cheapest one you can.
http://www.firehooksunlimited.net/probars.html