Under the right conditions I would use one, but if it's for a training issue I try to address the training issue.
With my horse, I only use one when riding in a group because he puts his head practically in my face and turns his head sideways to evade my aids. He doesn't do it as badly with the running martingale. I don't ride with others often so training is slow going. I do, however ride with two sets of reins and only use the martingale if he starts the evasion and use the reins connected straight to the bit otherwise. I try to give him a chance to do the right thing.
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