Good but down? ... Although ...

A priori good product, works in tandem with IMPECC shows cardio RC3 of the same make, except that the cardio sensor is faulty after only 4 outputs damage. I took another in exchange. We'll see if the unreliability of the first was accidental, or more generalized. Do not miss to share your impressions. Good sports experience to everyone.

Following information (24 June 2014)

I received the new replacement sensor that returned (previous thinking sensor returned to a defect).
When tested for recognition, same observation: the pulse sensor is not recognized by the watch.
After investigation, I understand that the sensor recognition is not implicit (logical too, you have to pair the watch sensor recognizes the staff, and not that of a running partner.)
So I restarted the pairing procedure, and the result is positive. => Perfect recognition.

So, I cast doubt my own judgment about the previous sensor and can imagine that the watch had lost the pairing with the first sensor.
2 stars previously granted to the product lose their justification.
I modify my previous assessment by ironing to 4 stars.
The loss of the 5th star would then be explained by the doubt that exists (false or true failure) and / or loss of pairing.

If I have further information, I will share.
Good run at all.