Decided to give this a whirl with my new Polar F6 after talking to a girl in my spinning class about it - so glad that I did! It was a little disappointing to have it arrive and realize that I needed a different transmitter from the one that came with my watch (You have to have a Wearlink from Polar or the Numetrex one - either can be bought online) to pop into the bra, but I was able to buy a Wearlink separately and it works perfectly! Uber comfy, perfect transmission (heart rate is right on) and NO CROSS TALKING with other spinners in my class! Woo Hoo! I love the fact that I don't have any slipping issues with this. Great product and idea - cannot believe it took someone this long!

This doesn't work as well as I had hoped with the Polar Heart Rate Monitor - It has put my heart rate over 200 bpm - when I am really down in the 130's. Eventually - it will get itself right - but then often in the middle of a workout I will just stop getting a heart rate at all. Not sure what is going on - I've only worn it 4-5 times now and haven't put it in the dryer, etc.
Also worth noting - it's not the Polar Receiver as it works fine with my Polar Soft Strap.