How is the new HR sensor on the newest AW? My issue with these watches has always been that you cannot get a good reading if you are in action, especially if you are interval training. You would have to stand still for a bit just to get a reading. My dream has always been to have a wrist based HR monitor which can keep up with fast paced interval training, but I haven't found one yet. I know the technology is inferior to chest bands, and I've appeased myself with a Scosche Rhythm armband that is fairly decent, and certainly better than any wrist monitor. But I'm curious to hear from owners how the AW is doing in this regards as I'm thinking of picking one up, but this is one of my main criteria.