If you arent showing, then what does it really matter? If you like a hackamore, go for it, if your horse responds to it, use it.
Understand that if you are showing, or if you are planning to show, then you need to teach your horse to accept and respond to a bit, you need to look at the rule books to whichever show you are planning to participate in and you need to be sure you are using a legal bit.
If your horse is 5 or under then you can show western in a bosal, but for english, I believe you have to use a bit.
Again, if you are not showing, then what does it really matter? Use what works for you.
One thing I do want to say is that most of the time (not all of the time, but alot...) the problem is not with the bit, or the horse... it's with the rider. Pay attention to your hands, make sure you arent over correcting or forgetting to reward the horse for giving to the pressure...
I personally like it when my horse can go in any type of bit, from a snaffle to a correctional port w/out having any issues. I like being able to use a bosal and a halter to ride, I think horses should be versatile...
Anyway... let us know how the hackamore works out for you!