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I have two.....but it might work well with a really narrow face.
We just got Deep 6 regs. My wife is really liking their standard mouthpiece and she is also very petite. I also bought two other mouthpiece options, one of which is trimmable (how far back in the mouth it goes) and moldable. It's also her 'color'!! At the moment though she wants to dive with the one it came with. I did have a swivel installed as I believe that the 'tugging' contributes to jaw fatigue and the swivel will help alleviate this.
And 7' is just right....ahhh.Hose length also needs to be considered, too long and it'll push, too short and it'll tug.
And 7' is just right....ahhh.