I bought one second-hand to test it out. It was the one with 18" wheels.
Even with three speeds, I wouldn't recommend the Strida for trips longer than a few km/miles, and on relatively flat terrain.
I didn't like the gear box, because 1) you can't raise the pedal after stopping without changing gear, and 2) there's no gear indicator so you never know which gear you'll be using when starting again.
Like on recumbents, you can't stand on the pedals, so watch out for speed bumps and potholes.
And that's besides the awkward position, the instability at low speed, and the lack of frame-mounted bag in the front + tiny rear rack (→ backpack.)
The only good thing about the Strida is that uses a belt drive and disk brakes, and it's fast to fold.
It's just too limited.
If you can get one for cheap like I did, you can always sell it back if you don't like it and not lose money in the process.