When I got mine in 2008 there were 4 types. E3, sports, Dash and Vibe.

E3 and sports have foot break.
Dash 2 buttons either side on handle that you push in and fold handle down.
Vibe squeeze button middle of handle.

The Vibe you can fold down with toddler seat attached

Dash has plastic part on front of main seat for feet rather than material on sport. Ummmm cant remember much else at momment.

We have Dash and its great.