Garmin Forerunner 101 Handheld GPS Receiver

I recently ordered the forerunner 101 thinking that the only difference between the 101 and 201 was the price ($30 less), need for 2 AAA batteries, and lack of a serial PC connection.
After opening the package, I quickly realized that the 101 is about 30% thicker than the 201. I've used my neighbor's Forerunner 201 several times and it is pretty comfortable to wear for long periods of time. The size difference is big enough for me to return the 101 and exchange it for a 201. The 101 is definitely less comfortable to wear on your wrist.