Wow! I got my Sigma Sport HRM today and I had to take it out for a spin. The chestband was very comfortable and it reads great. I didn't have to use any gel on the chestband - I sweat a lot. It really helps you get more in touch with your body to know exactly what your heart is doing.
I don't know exactly how to use it yet and I didn't personalize my settings yet but I was able figure out how it works basically and found it very interesting. I did a 5k run today and stayed in the 175-180 BPM range for most of the run, I finished up around 185 BPM. I actually took it a little easy on myself today because I also did a 5K yesterday. Tomorrow I'm alternating with on my mountain bike with about an hour workout. I can't wait to compare my readings.
All in all it's a great little piece of hardware for $46.00 and well worth the money compared to the other units on the market. It's also very easy to change batteries on both the chestband and the watch itself. There's no need to send the watch back to the manufacturer just to replace a battery. I like it so much that I'm probably going to wear it during the day also. Great buy.