Whether it's a good or bad thing is a bit subjective to many factors. If your horse goes well in a halter and lead rope, and you are looking to trail ride with it, I'd say try it. Try one that is milder, I use an english hackamore, and ride with a loose rein. If you are use to "contact" with your horses bit/mouth, stay away from a hackamore. It is not meant to be ridden in with contact.
Look for one with shorter shanks (longer they are the more lbs of pressure they deliver with little effort on riders part) and a wider band that goes over the area above the nose. Again the wider area the pressure is delivered to the less severe affect. Of course there is the bosal hackamore that many western trainers use . I haven't used one so can't offer any info/help on that.
There is also the Dr Cooks Bitless Bridle that is used by some of the members here. It is a bit pricier than a "hackamore bit", but it is of quality materials and lasts a long time. Easy to care for.
I switched T, my mare to an english hack years ago. The best thing was that it forced me to use seat,leg,weight aids more than rein which has only helped me develop as a rider.
Good luck to you. :)