Glider <---> Elliptical
I, too, have bad knees. I have a Weslo Air Strider - same type of machine as the Glider only no bands and it is heavier.
I LOVE MY STRIDER!!!!! No impact, legs stay straight so no strain on knees, and a good work-out for me. I do 1200 reps (strides) in 20 minutes which is really flying for me since I'm not the athletic type. I started out slowly, though, and worked up to this.
One of my daughters has an elliptical trainer and likes it a lot. I have not used it, though. She had to start really slowly and build up. She even has to start slowly if she has missed a few days. She does not have any knee problems.
I would recommend the Glider based on the knee problem.
Best wishes... I hope I helped some.
Getting healthier daily!!! Carleen...
HW = 240
Started Atkins at 206.2
CW = 179
GW = 165