Tried the Bluetreks. Battery life is great, design and sound suck. The moto 820s were the best sounding pair I've tried and very easy to use. I got rid of them because I looked like Princess Leah in the gym. Sorry, I didn't coin that one.
The S9s were the compromise headset for me. Pretty good sound, fit, and looks very discrete. Only gripe is brief disconnects when in my pocket. Place your mogul on an armband, and it shouldn't be a problem.