Yes, I picked up the pace a little in the last 100 m, but it wasn't a sprint or anything. I could have turned around and kept going if I wanted. Although it wouldn't have been at the same pace. I'm trying to teach myself to swim a consistent 1:50 for 100 m. That gets me down to about an 18:30 K, or 37 min 2 K. That's respectable for a half tri. Even if I can't keep up with swim demons J and K.
Hmmm, I'm not so far off that time now. Maybe what I should do is try 55 second 50 m laps and see how long I can keep it up. And hope that nobody gets in my way.
The watch and heart monitor I use is from Timex. It's the 30 lap model. The hardest part about the whole thing was teaching myself to push the button during the turn. Normally I only put one hand on the wall, tuck my feet, turn and push. The other arm trails behind ready to lead the way. So now I had to figure out how to get both hands together. And remember to push the button every other lap, for 100 m split times.
I've never had any problems with the heart rate monitor, biking, running, or swimming. The only reason I got a new one is that the idiot who replaced the watch battery didn't seal the watch up properly. You can't buy just the watch part. I like this one, once I got used to the buttons. If I'm wearing the heart rate, the review lets me look at minimum, maximum, and average heart rates for the whole workout, and it gives the average heart rate for each lap, the lap time, and the cumulative time for that lap. Not as fancy as the Garmin, but way cheaper.