I bet I've got about a dozen stabilizers sitting around. Each style has it's own purpose. How effective they are is subjective to the shooter and there bow it's on. You'll have one group of people say they are absolutely worthless, and another group that won't shoot without one. You'd best be served by trying a couple out and seeing if you like them.
Some stabilizers work differently than others. Some are designed to steady you out by putting the weight as far out there as possible, others are designed solely to help with shock from the bow. There are even more that are a combination of the two. If you look around online, you'll see that there are more styles available than we could list here. And they all claim to be the best. You just need to find what works for you.
I shoot a 36" stab for target, and usually a 12" stab for hunting. Too much longer for hunting and it seems to be obtrusive, at least for me.
Seriously though, I've had guys tell me I was a sucker for shooting with one. I guess their opinion would carry more weight if they had come close to outshooting me.
I like them, others don't. It's whatever you prefer.