I used an Indian Hackamore/Bosal on Lacey for a while and she went great in it. I've switched her to just a rope halter with metal rings for the reins for the summer and she's going really well in it too. She's a little less sensitive to the halter but still totally responsive and fine.
I haven't ridden her on the trail yet in just the halter because I'm not 100% comfortable with it yet, but I'm sure she'll do fine.
She has tried to run away with me in the Indian Bosal thing and it was basically a situation where it wouldn't have mattered if I had had a bit or not (it was the first time she got to gallop in a big open space so she was like "WOOHOOOOO!!!!" with her head way in the air) but I got her back really easily by just angrily growling her name, so that was fine with me.
The only thing I don't like very much about riding in a halter all the time or in the Indian Bosal is that I feel like there is less precision in it. That's fine by me since I don't need Lacey to be super precise, but for someone who needs that, I'm not sure I would suggest bitless. However, that feeling of less precision has forced me to rely on my legs a whole lot more. I used to have a major problem using my legs but now I use my legs first, then hands. So, now I guess Lacey is very precise, just precise off my legs, not hands. If that makes any sense...
I used to ride her in a snaffle but her previous owners let her blow through it all the time and as a result, she was rather pushy with it and heavy. She totally wasn't anywhere near being a problem, it just wasn't prime in my mind. Also, she didn't understand at all how to drink water with a bit in her mouth and since she's mainly a trail pony she needs to be able to drink when there's water and I didn't like having to always take her bridle off so she could drink.
I'm sure I could have worked through the heaviness issue, I just chose not to since she acts more comfortable bitless and she never seemed very comfortable with a bit.
Bitless isn't for everyone and it's not for every horse so I suggest you find out what your horse likes best and go from there. :)
Fabio - 13 year old Arabian/Lipizzaner gelding
Hazel - 14 year old Angora goat
Atticus - 4 year old LaMancha/Alpine cross goat
Rest peacefully, Lacey.