Cindy, is your horse gaited? And which Robart bit did you use. I want to be able to control my horse but not hurt him.
It's kinder to be soft with a stronger bit than it is to be strong with a bit that's too soft.
If you like the methods your trainer uses for other things, I'd take her word for it on this bit and give it a try. Watch his reactions... if you apply it does he comply or does he fight and throw his head? One thing is, with a curb bit, you don't want to ride on contact with his mouth all the time like you can with a snaffle, you want to ride on a looser rein and apply the bit in pull and release motion as needed.
No, she isn't gaited. I'm much better now but still tend not to give her enough slack at times so I needed something that I could control her with but not be heavy in her mouth. That's what my trainer said anyway. She ordered it for me. I was looking for a pic on net. I'm headed out there in a little bit so I'll take a picture. It's a roller though.