Three legged dining chairs  

Variation
Mogens Lassen ca 1963 for Fritz Hansen.
http://www.modernamobelklassiker.com/

Good sit?
How are these chairs to sit in (namely the Wegner heart)? Are they fairly stable and comfortable?

Heart chair
Is stable but not very comfortable, imo. It has a flat seat and an open back.

3-legged...
funny, I have a thing for 3-legged tables, I find them elegantly balanced. But, I've always thought 3-legged chairs were awkward and uncomfortable.

Of all the nice three-legged...
Of all the nice three-legged examples here, I like the Papst the best. The fact that the design took in mind the backwards seating idea, a la Dan Conner, makes it all the more appealing.
Although, I'm not sure you'd want Dan Conner on one, but actually the chair looks pretty solid, much more so than some of the others.

3 legged chair
we have been making our 3 legged chair for the past 10 years. Very stable as the weight is mainly over the front 2 legs. It folds very flat and looks good on the wall. the back rest also pivots so it is very comfortable also.
http://www.tandemstudio.co.uk/proppy.htm