Not with Tern, but with Dahon.
I liked the look of the 'regular' sized wheels and went through three 26" wheeled folders before finally getting a Brompton. Both of my Dahons cracked on the seat tube around the welds.
They all rode really well when I had them, but having had so many problems with build quality, I'd be hard pressed to recommend them to anyone. I think there are some issues with the hinges of the Terns, but I'm not 100% on that.
The one questions I'd ask before you buy is "What do you actually need it for?"
I used mine on a commute that involved putting the bike in a car, taking it out, riding to the station, putting it on a train, getting off the train and cycling at the other end. Then doing it all the other way on the return.
I found mine somewhat impractical for commuting in the end. Most of the time they were fine, but whenever the trains were unusually busy, I'd not be able to fit in on and have to wait for the next one. I've not found that to be the case with the Brompton yet. Plus, we have two cars. One A6 estate (which the bike fitted into) and a Mini convertible (which the bike didn't fit into). Again, the Brompton fits in either, so whenever my wife goes away in the big car, I can still cycle.
Horses for courses. I liked mine when I had them (quality issues aside), but now I have a Brompton, I wonder why I didn't do it years ago.