I've only used the F6 for 5 work outs so far but it has been really great! It was very easy to set up, I barely even referenced the user guide. I haven't had any problems with it so far and I love using it to keep me on track throughout my exercise session. Just putting this out there: I am pretty overweight and I have a 41 inch chest--not the bust, but the area where the strap goes. The strap it comes with BARELY fit. So, if you are a larger person looking to get fit with this product, you may want to consider finding a strap that is larger - usually sold separately.
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