rollagain

https://www.elliptigo.com/

You could have done that for yourself. Oh, I think they also have a FB page, too.

I've test-ridden Elliptigos, both the long-stride and short-stride models. Surprisingly easy to ride, surprisingly smooth and stable for something on 20" wheels. The long-stride models are noisy and wear out track rollers in a hurry (I've read). Short-stride is quiet and doesn't need as much maintenance.

Build quality is very impressive.

The experience is quite different because of the gearing; your cadence is much lower.

Long-stride Elliptigos are regularly ridden in serious endurance races like P-B-P, but I don't know how. Aside from the aerodynamics, these machines are far less efficient than DF bikes or recumbents.

They're also selling a lot of SUBs--Stand-Up-Bikes. I just have to laugh at that. For a lot less money you could get an ordinary DF bike, remove the seat and post, put on a set of big platform pedals, and have the same thing.

@Darth Lefty may have seen one of these:

https://www.streetstrider.com/

I have one myself, and it's so much fun you can hardly stand it. Much more fun than the Elliptigo. If you get in a big empty parking lot (plenty of those lately) you can get this side-to-side motion going; they call it 'carving'. Puts a big silly grin on your face and you don't want to quit. Even better than that, though, I find that at the proper cadence and load, my breathing falls into sync with my arm and leg motions, and I get into a sort of flow state that I've never experienced with any other form of exercise. It's a freaking rush. I guess it must be like 'runner's high', though I used to run and never did experience that. Remarkable feeling, and I can reliably get it in seconds, but it requires having a good range of gears. I bought the 3-speed and only rarely and fleetingly achieved this, then I converted it to an 8-speed and can have it all the time.

Trouble is, I get doing this and completely exhaust myself in no time, but I think that's the point. And, it's no speed demon; doing rides in a park, I've noticed I can't reliably keep up with joggers, but that's my poor engine, too.

BIG advantage of the Elliptigos over the Street-Striders is the footplates. The ones on the SS have no raised edges on much of them and my feet tend to shift off to the sides, which is something I plan to do something about.