I use a bitless bridle on my horses for trail riding or when friends come over. We only use bits for more serious training or shows.
I like the bitless bridles, jumping hacks, or side-pulls better than mechanical hackamores because you have better communication (when direct or pully reining) and you have less of a chance of hurting the horse's nose/jaw. Thoe mechanical hacks with shanks can be pretty severe if you pull too hard!
I use a hackamore for my showjumper and he listens to it wonderfully he always used to argue with his bit (which was a level 1 myler) I only use a light contact though out the hole round and a hard contact only when I need it he behave perfectly and listens to evrything I have to say which is huge difference as he was a very cocky ( and still is) horse and thought he knew everything I've only done one compition in it on him and he wa perfect and told me when my contact was to hard by shaking his head we even endd up placing 5th in his 1m5 and gng double clear for the first time at this height and he behaved so well in it it he has made a humongous change since the hackamore hasbeen one him