My FIL is one of those "eliptigo fanatics". Then again, he's fanatical about a lot of things... Bikes, Jogging, Mustangs, Elipitigos... It's kinda insufferable how athletic he is... ANYWAY, I tried his eliptigo once. ONCE...
I didn't like it much at all. It felt stable, and using it was surprisingly easy, but that elliptical motion just doesn't do it for me. It was like taking many baby steps on my toes and I didn't really feel like I was getting a full range of motion in each stroke. On the bike and when I jog I'm so used to extending my leg that it just felt wrong (like being in a low gear bombing down a hill "wrong").
Maybe if I was more invested in using the darn thing I'd learn to love it, but right now it just seems like a fad that I just don't get!