I think that the product itself is still hit and miss. I have had mine back and forth to my LBS for over a year. Parts swapped from new units, replaced with a new unit, different location for the sensors - none of which have overcome the basic problems of the computer cutting in and out and thin data readings as a result. They have decided that you are either the kind of rider who doesn't notice this type of stuff and puts up with the issues, or not. If not, they say that they are now trying to steer folks away from the unit altogether.
I can absolutely tell one thing. These units are much more susceptible to interference and signal loss than other Polar units. I have taken my CS200 Cad bike out on my neighborhood loop and had the unit cut out several times a ride. My son can ride along with me on my 725X bike and only pick up electrical interference to the HR signal at one place where we pass over a mega-transmission cable, and even then this occurs maybe 1 ride in 20. On my urban and city commute, I drop signal about once a mile. It is really ridiculous.
The only thing that I would add is that some folks do manage to get a good setup. And then some of them manage to keep it working after that. I do believe them to be the exception though based upon what I have run into, seen other riders experiencing, talking to the shop techs, and reading around on the boards.
Personally, I am just glad that I bought mine from the kind of LBS that will do anything to keep you coming back. Even then, if they weren't right around the corner from where I work commute, I wouldn't be playing along with them at this point. I figure that I will move on to something else before too much longer. YMMV though. I hope your luck is better.