Yes, there are different models. The newest one has a heart rate monitor in the handles. Hopefully someone on this board will post better information than I can. I just wanted to let you know that you were not imagining things!!!
Also, Weslo makes an Air Strider. I have one and love it. It is the same idea as the Gazelle but is heavier and does not have the elastic bands.
If you get a Gazelle I'm sure you will like it.
Getting healthier daily!!! Carleen...
HW = 240
Started Atkins at 206.2
CW = 179
GW = 165